How can I stop Postfix from accepting mail to local-users @ my-FQDN from the outside world?
$ hostname -f hostname.example.com
Postfix is accepting mail to any-local-user at my-FQDN. So we'll use
email@example.com as the example local user I want to stop receiving mail for from the outside world.
I have a pretty basic Postfix/Dovecot/SASL/LDA setup, but let me share some of the details.
- Receive mail for virtual local domains/users on :25
- Virtual users send mail on :587 authenticated via Dovecot SASL
I've tried reversing users in
/etc/aliases and Postfix's
virtual_alias_maps.cf, but no luck. I've run newaliases and postmap after updating them.
#/etc/aliases: #root: firstname.lastname@example.org #/etc/postfix/virtual_alias_maps.cf: root email@example.com
I think I have FOUR* (updated) choices left...
- In postfix/main.cf, mess with
mydestination. I'm pretty sure I need to keep my FQDN here, so I don't think removing it is a good option. EDIT: Yes, although removing your FQDN from mydestination disables the outside world from sending mail to local users, this is not the proper way to disable it because that hoses other things.
- In postfix/main.cf, is there a setting for
smtpd_recipient_restrictionsto disable this? I can't find one in the docs.
- Hope that someone reads this who knows the right way.
Here is the relevant part of my Postfix main.cf:
myhostname = hostname.example.com mydomain = example.com mydestination = $myhostname, localhost.$mydomain, localhost smtpd_recipient_restrictions = reject_unknown_recipient_domain, reject_non_fqdn_recipient, reject_unauth_destination, permit_mynetworks, permit
Here is the relevant part of my Postfix master.cf:
submission inet n - - - - smtpd -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -o smtpd_sasl_type=dovecot -o smtpd_sasl_path=private/auth -o smtpd_recipient_restrictions= reject_unknown_recipient_domain, reject_non_fqdn_recipient, permit_sasl_authenticated, reject
P.S. Here is the HowTo I took a lot of my setup from: VirtualUserFlatFilesPostfix