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Biggie
Asked: 2015-02-16 05:32:20 +0800 CST

localhost in postfix's mydestination

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I noticed that many tutorials on the web specify the mydestination variable of postfix like this:

mydestination = localhost, localhost.myhostname, myhostname, mydomain1.com, mydomain2.com

Note: myhostname is the name postfix uses in HELO.
However this would allow an external client to send an email to user@localhost. Of course only if user is a valid username and postfix' restrictions (like reject_non_fqdn_recipient) are not used.

Since I want to accept mails only for mydomain1.com and mydomain2.com I changed the line at my server to:

mydestination = mydomain1.com, mydomain2.com

This works for external mail and even for local mails, where only the receiver-username without domain is used (due to the correct domain mydomain1.com in /etc/mailname).

Now I wonder whether the absence of localhost etc. in mydestination can cause any problems or if my configuration is fine.

postfix

1 Answers

  1. Best Answer

    To reject mail for specific recipient, put in main.cf:

    smtpd_recipient_restrictions = permit_my networks, reject_unknown_recipient_domain, reject_unauth_destination, check_recipient_access hash:/etc/postfix/recipient_reject

    In /etc/postfix/recipient_reject:

    [email protected] REJECT

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