47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
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# Send out email from specified IP address
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If you have multiple IP addresses available on your iRedMail server, and would like to send from different IP Addresses for different domains, follow the steps below.
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### Requirement
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This can only be set up on Postfix version`>=2.7.x`, because the parameter we need `sender_dependent_default_transport_maps ` is available in Postfix-2.7 and later releases.
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To check your Postfix version run:
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```
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# postconf mail_version
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```
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Which would return something like: `mail_version = 2.10.3`
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### Steps
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* Add Postfix setting `sender_dependent_default_transport_maps` to the end of `/etc/postfix/main.cf` like below:
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```
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sender_dependent_default_transport_maps = pcre:/etc/postfix/sdd_transport.pcre
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```
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* Add file `/etc/postfix/sdd_transport.pcre` with below content. NOTE: I use domain 'example.com' for testing, it will use transport 'sample-smtp' - see examples.
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```
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/@example\.com$/ sample-smtp:
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```
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* Create new outgoing SMTP transports in `/etc/postfix/master.cf` like below. Note: you must replace our sample IP address `172.16.244.159 ` with your IP address.
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```
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sample-smtp unix - - n - - smtp
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-o smtp_bind_address=172.16.244.159
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# -o smtp_helo_name=example.com
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# -o syslog_name=postfix-example-com
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```
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Option `smtp_helo_name` and `syslog_name` are optional.
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After this restart the Postfix Service to apply your changes,
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```
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# /etc/init.d/postfix restart
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```
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Note: any unmatched domains will continue using the server's primary IP address just as before.
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