Sendmail: Theory and Practice, Second Edition
A comprehensive guide to the nooks and crannies of Sendmail, the most-popular electronic mail utility for those using Unix-based servers.
TABLE OF CONTENTS Sendmail: Theory and Practice, Second Edition
Appendix C: Mailer Flags
The following flags [1] may be set in the mailer description. Any other flags may be used freely to conditionally assign headers to messages destined for particular mailers. Flags marked with are not interpreted by the sendmail binary; these are the conventionally used to correlate to the flags portion of the H line. Flags marked with apply to the mailers for the sender address rather than the usual recipient mailers.
| a | Run Extended SMTP (ESMTP) protocol (defined in RFCs 1869, 1652, and 1870). This flag defaults on if the SMTP greeting message includes the word "ESMTP". |
| A | Look up the user part of the address in the alias database. Normally this is only set for local mailers. |
| b | Force a blank line on the end of a message. This is intended to work around some stupid versions of /bin/mail that require a blank line, but do not provide it themselves. It would not normally be used on network mail. |
| c | Do not include comments in addresses. This should only be used if you have to work around a remote mailer that gets confused by comments. This strips addresses of the form "Phrase " or "address (Comment)" down to just "address". |
| C | If mail is received from a mailer with this flag set, any addresses in the header that do not have an at sign ("@") after being rewritten by ruleset three will have the "@domain" clause from the sender envelope address tacked on. This... |
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