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1.1 ! root 1: '\"macro stdmacro ! 2: .if n .pH g1.mail %W% of %G% ! 3: .nr X ! 4: .if \nX=0 .ds x} mail 1 "Essential Utilities" "\&" ! 5: .if \nX=1 .ds x} mail 1 "Essential Utilities" ! 6: .if \nX=2 .ds x} mail 1 "" "\&" ! 7: .if \nX=3 .ds x} mail "" "" "\&" ! 8: .TH \*(x} ! 9: .SH NAME ! 10: \f4mail\f1, \f4rmail\f1 \- read mail or send mail to users ! 11: .SH SYNOPSIS ! 12: .SS Sending mail: ! 13: .PP ! 14: \f4mail\f1 ! 15: [ ! 16: \f4\-tw\f1 ! 17: ] [ ! 18: \f4\-m\f1 ! 19: .I message_type ! 20: ] ! 21: \f2recipient . . .\f1 ! 22: .PP ! 23: \f4rmail\f1 ! 24: [ ! 25: \f4\-tw\f1 ! 26: ] [ ! 27: \f4\-m\f1 ! 28: .I message_type ! 29: ] ! 30: \f2recipient . . .\f1 ! 31: .PP ! 32: .SS Reading mail: ! 33: .PP ! 34: \f4mail\f1 ! 35: [ ! 36: \f4\-ehpPqr\f1 ! 37: ] [ ! 38: \f4\-f\f1 ! 39: \f2file\f1 ! 40: ] ! 41: .PP ! 42: .SS Forwarding mail: ! 43: .PP ! 44: \f4mail \-F\fP \f2recipient . . .\f1 ! 45: .PP ! 46: .SS Debugging: ! 47: .PP ! 48: \f4mail\fP [ \f4\-x\fP\f2debug_level\fP ] [ \f2other_mail_options\fP ] ! 49: \f2recipient . . .\f1 ! 50: .PP ! 51: \f4mail\f1 ! 52: \f4\-T\f1 ! 53: .I mailsurr_file ! 54: \f2recipient . . .\f1 ! 55: .SH DESCRIPTION ! 56: .PP ! 57: A ! 58: .I recipient\^ ! 59: is usually a user name recognized by ! 60: \f4login\fP(1). ! 61: When ! 62: .I recipients\^ ! 63: are named, ! 64: \f4mail\fP ! 65: assumes a message is being sent ! 66: (except in the case of the \f4\-F\fP option). ! 67: It reads from the standard input up to an end-of-file ! 68: (cntrl-d) or, ! 69: if reading from a terminal device, ! 70: until it reads a line consisting of just a period. ! 71: When either of those indicators is received, ! 72: \f4mail\fP ! 73: adds the ! 74: .I letter\^ ! 75: to the ! 76: .I mailfile ! 77: for each ! 78: .IR recipient . ! 79: .PP ! 80: A \f2letter\fP is composed of some \f2header lines\fP followed by a blank ! 81: line followed by the \f2message content\fP. ! 82: The \f2header lines\fP section of the letter consists of one or more UNIX ! 83: postmarks: ! 84: .sp .5 ! 85: .RS ! 86: \f4From\f1 \f2sender date_and_time\f1 [\f4remote from\f1 \f2remote_system_name\f1] ! 87: .RE ! 88: .sp .5 ! 89: followed by one or more standardized message header lines of the form: ! 90: .sp .5 ! 91: .RS ! 92: \f2keyword-name\f4\f4:\f1 [\f2printable text\f1] ! 93: .RE ! 94: .sp .5 ! 95: where \f2keyword-name\fP is comprised of any printable, ! 96: non-whitespace, characters other than colon (`:'). ! 97: A \f4Content-Length:\fP header line, ! 98: indicating the number of bytes in the \f2message content\fP will always be ! 99: present. ! 100: A \f4Content-Type:\fP header line that describes the type of the ! 101: \f2message content\fP (such as text, binary, multipart, etc.) will always ! 102: be present unless the letter consists of only header lines with no message ! 103: content. ! 104: Header lines may be contined on the following line if that line starts with ! 105: white space. ! 106: .SS Sending mail: ! 107: .PP ! 108: The following command-line arguments affect SENDING mail: ! 109: .PD 0 ! 110: .TP ! 111: \f4\-m\f1 ! 112: causes a \f4Message-Type:\fP line to be added to the message header with ! 113: the value of \f2message_type\fP. ! 114: .TP ! 115: \f4\-t\f1 ! 116: causes a \f4To:\f1 line to be added to the message header ! 117: for each of the intended recipients. ! 118: .TP ! 119: \f4\-w\f1 ! 120: causes a letter to be sent to a remote recipient without waiting for the ! 121: completion of the remote transfer program. ! 122: .PD ! 123: .PP ! 124: If a letter is found to be undeliverable, it is returned to the ! 125: sender with diagnostics that indicate the location and nature of the ! 126: failure. ! 127: If ! 128: \f4mail\fP ! 129: is interrupted during input, ! 130: the message is saved in the file ! 131: \f4dead.letter\f1 ! 132: to allow editing and resending. ! 133: \f4dead.letter\f1 ! 134: is always appended to, ! 135: thus preserving any previous contents. ! 136: The initial attempt to append to (or create) \f4dead.letter\fP will be in the ! 137: current directory. ! 138: If this fails, \f4dead.letter\fP will be appended to (or created in) the user's ! 139: login directory. ! 140: If the second attempt also fails, no \f4dead.letter\fP processing will be ! 141: done. ! 142: .PP ! 143: \f4rmail\fP ! 144: only permits the sending of mail; ! 145: \f4uucp\fP(1C) ! 146: uses ! 147: \f4rmail\fP ! 148: as a security precaution. ! 149: Any application programs that generate mail messages should be sure to ! 150: invoke \f4rmail\fP rather than \f4mail\fP for message transport and/or ! 151: delivery. ! 152: .PP ! 153: If the local system has the ! 154: Basic Networking Utilities installed, ! 155: mail may be sent to a recipient on a remote system. ! 156: There are numerous ways to address mail to recipients on remote systems ! 157: depending on the transport mechanisms available to the local system. ! 158: The two most prevalent addressing schemes are UUCP-style and ! 159: Domain-style. ! 160: With UUCP-style addressing, ! 161: remote recipients are specified ! 162: by prefixing the recipient name with the remote system name and ! 163: an exclamation point (such as sysa!user). ! 164: A series of system names separated by exclamation points ! 165: can be used to direct a letter through an extended ! 166: network (such as \f4sysa!sysb!sysc!user\f1). ! 167: With Domain-style addressing, ! 168: remote recipients are specified by appending an `\f4@\f1' and domain (and ! 169: possibly sub-domain) information to the recipient name ! 170: (such as \[email protected]\f1). ! 171: (The local System Administrator should be consulted for details on which ! 172: addressing conventions are available on the local system.) ! 173: .PP ! 174: .SS Reading Mail: ! 175: .PP ! 176: The following command-line arguments affect READING mail: ! 177: .PD 0 ! 178: .TP ! 179: \f4\-e\f1 ! 180: causes mail not to be printed. ! 181: An exit value of 0 is returned if the user has mail; ! 182: otherwise, an exit value of 1 is returned. ! 183: .TP ! 184: \f4\-h\f1 ! 185: causes a window of headers to be initially displayed rather than the latest ! 186: message. The display is followed by the `\f4?\f1' prompt. ! 187: .TP ! 188: \f4\-p\f1 ! 189: causes all messages to be printed without prompting for disposition. ! 190: .TP ! 191: \f4\-P\f1 ! 192: causes all messages to be printed with \f2all\fP header lines displayed, ! 193: rather than the default selective header line display. ! 194: .TP ! 195: \f4\-q\f1 ! 196: causes ! 197: \f4mail\fP ! 198: to terminate after interrupts. ! 199: Normally an interrupt causes only the ! 200: termination of the message being printed. ! 201: .TP ! 202: \f4\-r\f1 ! 203: causes messages to be printed in first-in, first-out order. ! 204: .TP ! 205: \f\B\-f\fP\0\f2file\fP ! 206: causes ! 207: \f4mail\fP ! 208: to use ! 209: .I file\^ ! 210: (such as ! 211: \f4mbox\f1) ! 212: instead of the default ! 213: .IR mailfile . ! 214: .PD ! 215: .PP ! 216: \f4mail\fP, ! 217: unless otherwise influenced by command-line arguments, ! 218: prints a user's mail messages ! 219: in last-in, first-out order. ! 220: The default mode for printing messages is to display only ! 221: those header lines of immediate interest. ! 222: These include, but are not limited to, ! 223: the UNIX \f4From\fP and \f4>From\fP postmarks, ! 224: \f4From:\fP, ! 225: \f4Date:\fP, ! 226: \f4Subject:\fP, ! 227: and \f4Content-Length:\fP header lines, ! 228: and any recipient header lines such as ! 229: \f4To:\fP, ! 230: \f4Cc:\fP, ! 231: \f4Bcc:\fP, ! 232: etc. ! 233: After the header lines have been displayed, ! 234: \f4mail\fP will display the contents (body) of the message only if it ! 235: contains no unprintable characters. ! 236: Otherwise, \f4mail\fP will issue a warning statement about the message ! 237: having binary content and \f4not\fP display the content. ! 238: (This may be overridden via the \f4p\fP command. See below.) ! 239: .PP ! 240: For each message, ! 241: the user is prompted with a ! 242: \f4?\f1, ! 243: and a line is read from the standard input. ! 244: The following commands are available ! 245: to determine the disposition of the message: ! 246: .PD ! 247: .TP 21 ! 248: \f4#\f1 ! 249: Print the number of the current message. ! 250: .TP ! 251: \f4\-\f1 ! 252: Print previous message. ! 253: .TP ! 254: <new-line>, \f4+\f1, or \f4n\f1 ! 255: Print the next message. ! 256: .TP ! 257: \f4!\f2command\^\f1 ! 258: Escape to the shell to do ! 259: .IR command . ! 260: .TP ! 261: \f4a\f1 ! 262: Print message that arrived during the \f4mail\fP session. ! 263: .TP ! 264: \f4d\f1, or \f4dp\f1 ! 265: Delete the current message and print the next message. ! 266: .TP ! 267: \f4d \f2n\fP\f1 ! 268: Delete message number \f2n\fP. Do not go on to next message. ! 269: .TP ! 270: \f4dq\f1 ! 271: Delete message and quit \f4mail\fP. ! 272: .TP ! 273: \f4h\f1 ! 274: Display a window of headers around current message. ! 275: .TP ! 276: \f4h \f2n\fP\f1 ! 277: Display a window of headers around message number \f2n\fP. ! 278: .TP ! 279: \f4h a\f1 ! 280: Display headers of all messages in the user's \f2mailfile\f1. ! 281: .TP ! 282: \f4h d\f1 ! 283: Display headers of messages scheduled for deletion. ! 284: .TP ! 285: \f4m\fP [ \f2persons\^\fP ] ! 286: Mail (and delete) the current message to the named ! 287: \f2person\f1(\f2s\f1). ! 288: .TP ! 289: .I n ! 290: Print message number \f2n\fP. ! 291: .TP ! 292: \f4p\f1 ! 293: Print current message again, ! 294: overriding any indications of binary (that is, unprintable) content. ! 295: .TP ! 296: \f4P\f1 ! 297: Override default brief mode and print current message again, ! 298: displaying all header lines. ! 299: .TP ! 300: \f4q\f1, or cntrl-\s-1D\s+1 ! 301: Put undeleted mail back in the ! 302: .I mailfile\^ ! 303: and quit \f4mail\fP. ! 304: .TP ! 305: \f4r\f1 [ \f2users\^\fP ] ! 306: Reply to the sender, and other \f2user(s)\f1, then delete the ! 307: message. ! 308: .TP ! 309: \f4s\fP [ \f2files\^\fP ] ! 310: Save message in the named ! 311: \f2file\f1(\f2s\f1)\^ ! 312: \f1(\f4mbox\f1 ! 313: is default) and delete the message. ! 314: .TP ! 315: \f4u\f1 [ \f2n\fP ] ! 316: Undelete message number \f2n\fP (default is last read). ! 317: .TP ! 318: \f4w\fP [ \f2files\^\fP ] ! 319: Save message contents, without any header lines, ! 320: in the named ! 321: .I files\^ ! 322: \f1(\f4mbox\f1 ! 323: is default) and delete the message. ! 324: .TP ! 325: \f4x\f1 ! 326: Put all mail back in the ! 327: .I mailfile\^ ! 328: unchanged and exit \f4mail\fP. ! 329: .TP ! 330: \f4y\fP [ \f2files\^\fP ] ! 331: Same as save. ! 332: .TP ! 333: \f4?\f1 ! 334: Print a command summary. ! 335: .PD ! 336: .PP ! 337: When a user logs in, the presence of mail, ! 338: if any, ! 339: is usually indicated. ! 340: Also, ! 341: notification is made if new mail arrives while using ! 342: \f4mail\fP. ! 343: .PP ! 344: The permissions of ! 345: .I mailfile\^ ! 346: may be manipulated using \f4chgrp\fP in two ways to alter the function of ! 347: \f4mail\fP. ! 348: The other ! 349: permissions of the file may be read-write (0666), read-only (0664), ! 350: or neither read nor write (0660) to allow different levels of privacy. ! 351: If changed to other than the default (mode 0660), the file will be preserved ! 352: even when empty to perpetuate the desired permissions. ! 353: (The administrator may override this file preservation using the ! 354: \f4DEL_EMPTY_MAILFILE\fP option of \f4mailcnfg\fP.) ! 355: .P ! 356: The group id of the mailfile must be \f4mail\f1 ! 357: to allow new messages to ! 358: be delivered, and the mailfile must be writable by group \f4mail\f1. ! 359: .SS Forwarding mail: ! 360: .PP ! 361: The following command-line argument affects FORWARDING of mail: ! 362: .sp .5 ! 363: .PD 0 ! 364: .TP ! 365: \f4\-F\fP\0\f2recipients\fP ! 366: Causes all incoming mail to be forwarded to ! 367: .IR recipients .\^ ! 368: The mailbox must be empty. ! 369: .PD ! 370: .PP ! 371: The \f4\-F\fP option causes the \f2mailfile\fP to contain ! 372: a first line of: ! 373: .sp .5 ! 374: .RS ! 375: \f4Forward to\f1 \f2recipient\^. . .\f1 ! 376: .RE ! 377: .sp .5 ! 378: Thereafter, all mail sent to the owner of the ! 379: .I mailfile\^ ! 380: will be forwarded to each ! 381: .IR recipient . ! 382: .PP ! 383: An \f4Auto-Forwarded-From: ...\f1 line ! 384: will be added to the forwarded message's header. ! 385: This is especially useful ! 386: in a multi-machine environment ! 387: to forward all a person's mail to a single machine, ! 388: and to keep the recipient informed if the mail ! 389: has been forwarded. ! 390: .PP ! 391: Installation and removal of forwarding is done with the ! 392: \f4\-F\f1 ! 393: invocation option. ! 394: To forward all your mail to \f4systema!user\f1 enter: ! 395: .sp .5 ! 396: .RS ! 397: \f4mail -F\0systema!user\f1 ! 398: .sp .5 ! 399: .RE ! 400: .PP ! 401: To forward to more than one recipient enter: ! 402: .sp .5 ! 403: .RS ! 404: \f4mail \-F\0"user1,[email protected],systemc!systemd!user3"\f1 ! 405: .sp .5 ! 406: .RE ! 407: .PP ! 408: Note that when more than one recipient is specified, the entire list ! 409: should be enclosed in double quotes so that it may all be ! 410: interpreted as the operand of the \f4\-F\f1 option. ! 411: The list can be up to 1024 bytes; either commas or white space can ! 412: be used to separate users. ! 413: .PP ! 414: If the first character of any forwarded-to recipient name is the pipe ! 415: symbol (`\(bv'), ! 416: the remainder of the line will be interpreted as a command to pipe the ! 417: current mail message to. ! 418: The command, known as a \f2Personal Surrogate\fP, ! 419: will be executed in the environment of the recipient of the ! 420: message (that is, basename of the \f2mailfile\fP). ! 421: For example, if the mailfile is \f4/var/mail/foo\f1, ! 422: \f4foo\fP will be looked up in \f4/etc/passwd\f1 ! 423: to determine the correct user\s-1ID\s+1, group\s-1ID\s+1, and \f4HOME\f1 directory. ! 424: The command's environment will be set to contain only ! 425: \f4HOME\f1, \f4LOGNAME\f1, \f4TZ\f1, \f4PATH\f1 ! 426: (= \f4/usr/bin:\f1), and \f4SHELL\f1 (= \f4/bin/sh\f1), ! 427: and the command will execute in the recipient's \f4HOME\f1 directory. ! 428: If the message recipient cannot be found in /etc/passwd, ! 429: the command will not be executed and a non-delivery notification with ! 430: appropriate diagnostics will be sent to the message's originator. ! 431: .PP ! 432: After the pipe symbol, escaped double quotes should be used ! 433: to have strings with embedded whitespace be considered as single arguments ! 434: to the command being executed. ! 435: No shell syntax or ! 436: metacharacters may be used unless the command specified is \f4/bin/sh\f1. ! 437: For example, ! 438: .sp .5 ! 439: .RS ! 440: \f4mail\0\-F\0"\(bv/bin/sh \-c \e"shell_command_line\e""\f1 ! 441: .RE ! 442: .sp .5 ! 443: will work, but is not advised since using double quotes and ! 444: backslashes within the shell_command_line is difficult to do correctly and ! 445: becomes tedious \f4very\fP quickly. ! 446: .PP ! 447: Certain %keywords are allowed within the piped-to command specification ! 448: and will be textually substituted for \f2before\fP the command line is ! 449: executed. ! 450: .sp .5 ! 451: .PD 0 ! 452: .TP ! 453: \f4%R\fP ! 454: Return path to the message originator. ! 455: .TP ! 456: \f4%c\fP ! 457: Value of the \f4Content-Type:\f1 header line if present. ! 458: .TP ! 459: \f4%S\fP ! 460: Value of the \f4Subject:\f1 header line if present. ! 461: .PD ! 462: .PP ! 463: If the command being piped to exits with any non-zero value, ! 464: \f4mail\fP will assume that message delivery failed and will generate a ! 465: non-delivery notification to the message's originator. It is allowable to ! 466: forward mail to other recipients \f4and\fP pipe it to a command, ! 467: as in ! 468: .sp .5 ! 469: .RS ! 470: \f4mail \-F\0"carol,joe,\(bvmyvacationprog %R"\f1 ! 471: .RE ! 472: .PP ! 473: Two UNIX System facilities that use the forwarding of ! 474: messages to commands are \f4notify\fP(1), ! 475: which causes asynchronous notification of new mail, ! 476: and \f4vacation\fP(1), ! 477: which provides an auto-answer capability for messages when the recipient ! 478: will be unavailable for an extended period of time. ! 479: .PP ! 480: To remove forwarding enter: ! 481: .sp .5 ! 482: .RS ! 483: \f4mail \-F\0"\^"\f1 ! 484: .RE ! 485: .PP ! 486: The pair of double quotes is mandatory to set a NULL argument for ! 487: the \-F option. ! 488: .PP ! 489: In order for forwarding to work properly the ! 490: .I mailfile\^ ! 491: should have \f4mail\fP as group ID, ! 492: and the group permission should be read-write. ! 493: .PP ! 494: \f4mail\fP will exit with a return code of \f40\fP if forwarding was ! 495: successfully installed or removed. ! 496: .SS Debugging: ! 497: .PP ! 498: The following command-line arguments cause \f4mail\fP to provide ! 499: DEBUGGING information: ! 500: .sp .5 ! 501: .PD 0 ! 502: .TP 22 ! 503: \f4\-T\fP\0\f2mailsurr_file ! 504: causes \f4mail\fP to display how it will parse and interpret ! 505: the \f4mailsurr\fP file. ! 506: .TP ! 507: \f4\-x\fP\f2debug_level\fP ! 508: causes \f4mail\fP to create a trace file containing debugging information. ! 509: .PD ! 510: .PP ! 511: The \f4\-T\fP option requires an argument that will be taken as the ! 512: pathname of a test \f4mailsurr\f1 file. ! 513: If NULL (as in \f4\-T ""\f1), ! 514: the system \f4mailsurr\f1 file will be used. ! 515: To use, type '\f4mail\fP \f4\-T\fP \f2test_file\0recipient\fP' and some trivial ! 516: message (like "testing"), ! 517: followed by a line with either just a dot (`.') or a cntrl-D. ! 518: The result of using the \f4\-T\f1 option will be displayed on standard output and ! 519: show the inputs and resulting transformations as \f4mailsurr\fP is ! 520: processed by the \f4mail\fP command for the indicated recipient. ! 521: Mail messages will never actually be sent or delivered when ! 522: the \f4\-T\f1 option is used. ! 523: .PP ! 524: The \f4\-x\f1 option causes \f4mail\fP to create a file named ! 525: \f4/tmp/MLDBG\f2process_id\f1 that contains debugging information ! 526: relating to how \f4mail\fP processed the current message. ! 527: The absolute value of \f2debug_level\f1 controls the verboseness ! 528: of the debug information. ! 529: Zero implies no debugging. ! 530: If \f2debug_level\f1 is greater than zero, ! 531: the debug file will be retained \f4only\f1 if \f4mail\fP encountered some ! 532: problem while processing the message. ! 533: If \f2debug_level\fP is less than zero the debug file will always be retained. ! 534: The \f2debug_level\f1 specified via \f4\-x\f1 overrides any specification ! 535: of \f4DEBUG\f1 in \f4/etc/mail/mailcnfg\f1. ! 536: The information provided by the \f4\-x\f1 option is esoteric and is ! 537: probably only useful to System Administrators. ! 538: The output produced by the \f4\-x\f1 option is a superset ! 539: of that provided by the \f4\-T\f1 option. ! 540: .SS Delivery Notification ! 541: Several forms of notification are available for mail by ! 542: including one of the following lines in the message header. ! 543: .PP ! 544: \f4Transport-Options:\f1 [ \f4/\f2options\f1 ] ! 545: .sp .2 ! 546: \f4Default-Options:\f1 [ \f4/\f2options\f1 ] ! 547: .sp .2 ! 548: \f4>To:\f1 \f2recipient\f1 [ \f4/\f2options\f1 ] ! 549: .PP ! 550: Where the ``/\f2options\f1'' may be one or more of the following: ! 551: .TP 12 ! 552: \f4/delivery\f1 ! 553: Inform the sender that the message was successfully delivered to the ! 554: \f2recipient\f1's mailbox. ! 555: .TP ! 556: \f4/nodelivery\f1 ! 557: Do not inform the sender of successful deliveries. ! 558: .TP ! 559: \f4/ignore\f1 ! 560: Do not inform the sender of \f4un\f1successful deliveries. ! 561: .TP ! 562: \f4/return\f1 ! 563: Inform the sender if mail delivery fails. ! 564: Return the failed message to the sender. ! 565: .TP ! 566: \f4/report\f1 ! 567: Same as \f4/return\f1 except that ! 568: the original message is not returned. ! 569: .PP ! 570: The default is \f4/nodelivery/return\f1. ! 571: If contradictory options are used, the first will ! 572: be recognized and later, conflicting, terms will be ignored. ! 573: .SH FILES ! 574: .PD 0 ! 575: .TP 20 ! 576: \f4dead.letter\f1 ! 577: unmailable text ! 578: .TP ! 579: \f4/etc/passwd\f1 ! 580: to identify sender and locate recipients ! 581: .TP ! 582: \f4/etc/mail/mailsurr\f1 ! 583: routing / name translation information ! 584: .TP ! 585: \f4/etc/mail/mailcnfg\f1 ! 586: initialization information ! 587: .TP ! 588: .SM ! 589: \f4$HOME\*S/mbox\f1 ! 590: saved mail ! 591: .TP ! 592: .SM ! 593: \f4$MAIL\*S\f1 ! 594: variable containing path name of ! 595: .I mailfile\^ ! 596: .TP ! 597: \f4/tmp/ma\f1\(** ! 598: temporary file ! 599: .TP ! 600: \f4/tmp/MLDBG\f1\(** ! 601: debug trace file ! 602: .TP ! 603: \f4/var/mail/\f1\(**\f4.lock\f1 ! 604: lock for mail directory ! 605: .TP ! 606: \f4/var/mail/:saved\f1 ! 607: directory for holding temp files to prevent loss of data in the event of a ! 608: system crash. ! 609: .TP ! 610: \f4/var/mail/\f1\f2user\f1 ! 611: incoming mail for \f2user\fP; ! 612: that is, the ! 613: .I mailfile\^ ! 614: .PD ! 615: .SH SEE ALSO ! 616: \f4chmod\fP(1), ! 617: \f4login\fP(1), ! 618: \f4mailx\fP(1), ! 619: \f4notify\fP(1), ! 620: \f4write\fP(1), ! 621: \f4vacation\fP(1) ! 622: .sp .2 ! 623: \f4mail_pipe\fP(1M), ! 624: \f4mailsurr\fP(4), ! 625: \f4mailcnfg\fP(4) in the \f2System Administrator's Reference Manual\f1. ! 626: .br ! 627: .IR "User\'s Guide" . ! 628: .SH NOTES ! 629: The "Forward to recipient" feature may result in a loop. ! 630: Local loops (messages sent to \f4usera\f1, which are forwarded to ! 631: \f4userb\f1, which are forwarded to \f4usera\f1) will be detected ! 632: immediately. Remote loops (mail sent to \f4sys1!usera\fP1 which is forwarded ! 633: to \f4sys2!userb\f1, which is forwarded to \f4sys1!usera\f1) will also be ! 634: detected, but only after the message has exceeded the built-in hop count ! 635: limit of 20. ! 636: Both cases of forwarding loops will result in a non-delivery ! 637: notification being sent to the message originator. ! 638: .PP ! 639: As a security precaution, the equivalent of a \f4chmod s+g\f1 is performed on ! 640: the \f2mailfile\fP whenever forwarding is activated via the \f4\-F\fP ! 641: option, ! 642: and a \f4chmod s\(mig\fP is done when forwarding is removed via the ! 643: \f4\-F\fP option. ! 644: If the set\s-1GID\s+1 mode bit is not set when \f4mail\fP ! 645: attempts to forward an incoming message to a command, ! 646: the operation will fail and a non-delivery report with appropriate ! 647: diagnostics will be sent to the message's originator. ! 648: .PP ! 649: The interpretation and resulting action taken because of the ! 650: header lines described in the Delivery Notifications section ! 651: above will only occur if this version of \f4mail\fP is installed ! 652: on the system where the delivery (or failure) happens. ! 653: Earlier versions of \f4mail\fP may not support any types ! 654: of delivery notification. ! 655: .PP ! 656: Conditions sometimes result ! 657: in a failure to remove a lock file. ! 658: .PP ! 659: After an interrupt, the next message may not be printed; ! 660: printing may be forced by typing a ! 661: \f4p\f1. ! 662: .Ee
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