F
When V8.7 or above sendmail has been compiled with User Database support ( userdb ), you can specify this delivery agent flag for a delivery agent and thereby cause that delivery agent to perform a User Database lookup for each address it handles. For sender header and envelope addresses, a User Database mailname keyword is used to perform reverse aliasing. For recipient envelope addresses, a User Database maildrop keyword is used to perform additional forward aliasing. [25] Note that any address with a leading @ character (in the $ : part of the triple returned by the parse rule set 0) causes User Database lookups to be skipped . Also note that the absence of an F=i delivery agent flag (F=i) suppresses User Database rewriting of the envelope sender.
If the F=@ delivery agent flag is present, the delivery agent will try to use the User Database. If the F=@ delivery agent flag is absent, all User Database lookups are skipped. In general, this delivery agent flag should be present for the local and local-clone delivery agents but absent for all others. In configuration files prior to Version 6 (Section 17.5), this delivery agent flag is automatically set for the local delivery agent. |
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