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How can I block outgoing mail for a specific user (user@example.com) in Postfix to all but a specific list of domains (e.g. @example.com, @dot1q.com)?

I found a solution to block mail to a specific domain:

Edit the main.cf file (the default location is in /etc/postfix) and add transport_maps = hash:/etc/postfix/transport to the file. Create a file named /etc/postfix/transport, if it doesn’t exist. Add the following at the end of the transport file: example.com : dot1q.com : * discard:

but this unfortunately blocks email for all users. Is it possible to make this work for only one user user@example.com?

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The correct syntax for the transport file in you case should be (using regular expressions):

/^user@example\.com/ discard:
/.*/ :

The first line tells postfix to discard mail sent with address user@example.com, the second line tess postfix to accept everything else.

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Postfix provides 'check_sender_access' parameter. It can be used in /etc/postfix/main.cf as

smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/access

To block, out going emails for test@example.com, create /etc/postfix/access with following

test@example.com REJECT

after that run below commands

postmap /etc/postfix/access
service postfix restart

If you are using sendmail as a MTA then you edit the file /etc/mail/access and add the following rule in it,

From:test@example.com   REJECT

then restart the sendmail service as,

service sendmail restart

the user 'test' should not be able to send mails.

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