Of those shown, only the seven indicated are truly mandatory and must be declared
in every configuration file. The others are highly recommended.
25.8.2 Sender Headers
Certain header names are assumed by sendmail to contain information about the various
possible senders of a mail message. They are listed in Table 25-6 in descending
order of significance. Addresses withth e H_FROM flag (?§25.6.12 on page 1141) are
rewritten as sender addresses.
When returning bounced mail, sendmail always uses the envelope sender??™s address.
If the special header Errors-To: appears in the message, and if the UseErrorsTo option
Table 25-6. Sender headers (most to least significant)
Header ?§ Flags Defined by
Resent-Sender: ?§25.9 on page 1147 H_FROM,
H_RESENT
RFC2822
Resent-From: ?§25.12.19 on page 1157 H_FROM,
H_RESENT
RFC2822
Resent-Reply-To: ?§25.9 on page 1147 H_FROM,
H_RESENT
RFC2822
Sender: ?§25.12.35 on page 1166 H_FROM RFC2822
From: ?§25.12.19 on page 1157 H_FROM RFC2822
Apparently-From: ?§25.12.1 on page 1150 n/a Smail 3.0
Reply-To: ?§25.12.32 on page 1164 H_FROM RFC2822
Disposition-Notification-To: ?§25.12.16 on page 1156 H_FROM RFC2298
Return-Receipt-To: ?§25.12.34 on page 1165 H_RECEIPTTO Obsolete
Errors-To: ?§25.12.18 on page 1156 H_FROM,
H_ERRORSTO
sendmail (deprecated)
Full-Name: ?§25.12.20 on page 1158 H_ACHECK UUCP (obsolete)
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc.
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