How to setup postfix to relay mail for specific domains?

How to setup postfix to relay mail for specific domains?

So this is how you can configure Postfix forward (relay) all mail for one virtual domain to another mail server (smart host) before being sent to its final destination. You will need to do all of this as root, so either sudo or elevate to a root shell. Create a file that will contain the domains that will be processed by another server.

How to test postfix for specific domains or users?

Run the following command: Update the file path if needed Go ahead and test the configuration by sending a test message from the domain and review the headers at the receiving mail account, you should see the mail being sent to your smart host, or in my case MailRoute, before arriving to the servers for the outside mail account.

How to send mail to a specific domain?

From what I figured is the transport file is used to override DNS entries to direct mail for a particular domain to another server that may not exist in DNS records or is behind a firewall. I hope that this was informative and helpful to your needs.

How does discard no outgoing mails allowed postfix work?

DISCARD No outgoing mails allowed Postfix goes through the mail headers one-by-one. Each header line gets matched against the header_checks file line-by-line. If it matches the first line ( To: contains the allowed domain), it skips to the next header line and starts the header checks again from the top.

How to rewrite an address in Postfix mail?

Rewrite addresses to standard form Canonical address mapping Address masquerading Automatic BCC recipients Virtual aliasing Address rewriting when mail is delivered Resolve address to destination Mail transport switch Relocated users table Address rewriting with remote delivery Generic mapping for outgoing SMTP mail

What are the changes in postfix for mail server?

A “/file/name” pattern is replaced by its contents; “type:table” requests that a table lookup is done and merely tests for existence: the lookup result is ignored. IMPORTANT: If your machine is a mail server for its entire domain, you must list $mydomainas well.

How to use postfix to block mail based on from?

Lines 1-3 define the “ Optional restrictions that the Postfix SMTP server applies in the context of a client RCPT TO command ” (see smtpd_recipient_restrictions ).

How to reject mail based on from / sender?

This file defines the senders which I want to reject: Once I created those files, I ran this command to create the associate hash files: This will reject mail from those domains, sent to the address in question, with a status of 521. Why 521.