A question from a beginner Postfix admin.
What is the exact difference between writing in main.cf
:
smtpd_reject_unlisted_sender = yes
and
smtpd_sender_restrictions =
reject_unlisted_sender
?
Is there a real difference in operation or is smtpd_reject_unlisted_sender
just a way to enforce this restriction when some of rules listed in smtpd_sender_restrictions
results in PERMIT
?