Thank you! I had this exact issue and just couldn't wrap my head around
what was wrong, this solved things quite nicely.
/T
On 2020-10-02 00:00, Bob Proulx wrote:
Ranjan Maitra wrote:
> > > Oct 1 14:08:00 localhost postfix/smtpd[4142479]: fatal: in
parameter smtpd_relay_restrictions or smtpd_recipient_restrictions,
specify at least one working instance of: reject_unauth_destination,
defer_unauth_destination, reject, defer, defer_if_permit or
check_relay_domains
>
> My apologies: how do I do this/what should I do here?
Since you haven't shared your postfix configuration but just parts of
it in the master.cf then we can only point to the documentation.
Start here and read these:
http://www.postfix.org/postconf.5.html#smtpd_relay_restrictions
http://www.postfix.org/postconf.5.html#smtpd_recipient_restrictions
What is the value of these for you? This will produce some output
which shows the current configuration.
postconf smtpd_recipient_restrictions smtpd_relay_restrictions
For my use I leave smtpd_relay_restrictions set to the default value
and then set smtpd_recipient_restrictions. That's one valid
combination. But there are others.
At the least I would think something like this:
smtpd_recipient_restrictions =
permit_mynetworks,
reject_unauth_destination,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain
But in real use I have a much longer list with a lot more there for
blocking spam and other things. You should understand it before using
it and adjust it as needed for your environment.
Bob
