Dan Raymond via Postfix-users:
> The sendmail command (ie. /usr/sbin/sendmail) normally extracts
> the sender's display name from the comment field of /etc/passwd.
> This is used to populate the "From" header. However,
> when the -f option is used the /etc/passwd file is not consulted
Indeed. Postfix has multiple override mechanisms:
-f sets the envelope.from address. The value can be any email
address; it is not limited to names in /etc/passwd. Setting
this does not affect the "full name".
-F sets the "full name" (this can also be set with the NAME
environment variable). Setting this does not affect the envelope.from
address.
And so on.
This orthogonal approach may be unexpected for people who grew up
after Postfix was implemented.
Wietse
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