67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
# Enable postscreen service
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[TOC]
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__WARNING__: With postscreen service enabled, your users must use port 587 to
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send email, port 25 will be used by postscreen service instead of normal smtp
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service.
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## Enable postscreen service
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iRedMail ships a script to enable postscreen. You can enable it with steps below:
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1. Download script `enable_postscreen.sh` from [iRedMail source code
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repository](https://github.com/iredmail/iRedMail/blob/1.0/tools/enable_postscreen.sh).
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1. Upload this script to your iRedMail server, then execute it to enable
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postscreen service:
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```
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# bash enable_postscreen.sh
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```
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That's all.
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Important notes:
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* It will backup `/etc/postfix/main.cf` and `/etc/postfix/master.cf` first,
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if postscreen doesn't work, you can restore these 2 files.
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* It uses several DNSBL servers by default, you'd better open
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`/etc/postfix/main.cf` (Linux/OpenBSD) or `/usr/local/etc/postfix/main.cf`
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(FreeBSD) to check the DNSBL servers it enabled, you're free to remove some
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of them (or add new ones) if you want.
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## Disable postscreen service
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If your iRedMail already have postscreen service enabled, it's easy to disable
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it by following steps below.
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* Open file `/etc/postfix/master.cf`, find lines below (usually they're first
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few lines in this file):
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```
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#smtp inet n - - - - smtpd
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smtp inet n - - - 1 postscreen
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smtpd pass - - n - - smtpd
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```
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* Uncomment first line, comment out the other 2 lines:
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```
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smtp inet n - - - - smtpd
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#smtp inet n - - - 1 postscreen
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#smtpd pass - - n - - smtpd
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```
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* Now restart or reload Postfix service. That's it. No need to modify any
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setting in `/etc/postfix/main.cf`.
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## See Also
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If you don't want to use postscreen service, you can [enable DNSBL service](./enable.dnsbl.html)
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instead, it helps a lot too, but less effective than postscreen service.
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## References
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* [Postfix Postscreen Howto](http://www.postfix.org/POSTSCREEN_README.html)
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* [Postfix manual page: postscreen(8)](http://www.postfix.org/postscreen.8.html)
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