and time. This prints a line similar to (Web site management)

and time. This prints a line similar to the following: 220 al.mybox.com ESMTP Sendmail 8.9.3/8.9.3; Mon, 19 Jul 1999 18:47:23 -0400 # UNIX initial From header format (old $l macro) O UnixFromLine=From $g $d The UnixFromLine option defines the format of the From header line that is used as a message separator within mailbox files. The default value of $g $d prints the sender s e-mail address, followed by two blank spaces and the local date and time at which the message was received. The next lines define how to handle embedded newlines: # From: lines that have embedded newlines are unwrapped onto one line #O SingleLineFromHeader=False If the SingleLineFromHeader option is set to True, any new lines within the From: header are converted into spaces. Otherwise, the split header lines are retained. The next lines relate to how SMTP responds to a HELO request not associated with a hostname: # Allow HELO SMTP command that does not include a host name #O AllowBogusHELO=False If the AllowBogusHELO option is set to True, the restriction that a hostname must follow a HELO command is not enforced. If it is set to False (the default), the behavior specified by RFC 1123 is required. The next lines relate to quoting special characters: # Characters to be quoted in a full name phrase (@,;:()[] are automatic) #O MustQuoteChars=. By default (and according to RFC 821), the nine characters enumerated in the comment in the first line must be quoted if they appear in a nonaddress portion of an address (for example, the user s name or nickname). The . and characters can be specified in the MustQuoteChars option to require quoting as well. The next lines relate to delimiter characters: # delimiter (operator) characters (old $o macro) O OperatorChars=.:%@!^/[]+ The OperatorChars option lists the characters (in addition to the set of ()<>,; rn already defined by sendmail) that can be used as separators within an address. This option should not be altered. The next lines relate to initgroups: # shall I avoid calling initgroups(3) because of high NIS costs? #O DontInitGroups=False The DontInitGroups option (if set to True) forces sendmail to not process the initgroups system call. This is useful if groups have many members or a slow name service is used. The default value is False. The next lines relate to an obsolete function: # are group-writable :include: and .forward files (un)trustworthy? #O UnsafeGroupWrites=True The UnsafeGroupWrites option has been effectively replaced by various arguments to the DontBlameSendmail option, which was discussed early in this section. The next lines relate to sending errors: # where do errors that occur when sending errors get sent? #O DoubleBounceAddress=postmaster # where to save bounces if all else fails #O DeadLetterDrop=/var/tmp/dead.letter
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