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postfix header checks

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revsuine 2024-11-26 15:45:14 +00:00
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commit 8b04cfa06b
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content/blog/mail_server_alpine_postfix_dovecot_tutorial/index.md
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@ -386,6 +386,25 @@ mailbox_size_limit = 0
By default, `mailbox_size_limit` is `51200000`. This number is in bytes. You can similarly set a `message_size_limit`.
Let's hide some sensitive info that tends to get attached to email headers by clients. Edit
`/etc/postfix/header_checks`, or create it if it doesn't already exist, and add the following lines:
```plaintext
/^Received: .*/ IGNORE
/^User-Agent: .*/ IGNORE
/^X-Originating-IP: .*/ IGNORE
/^X-Mailer: .*/ IGNORE
/^Mime-Version: .*/ IGNORE
```
Now add the following to your `/etc/postfix/main.cf`:
```conf
header_checks = regexp:/etc/postfix/header_checks
smtp_header_checks = $header_checks
mime_header_checks = $header_checks
```
Finally, here are some various hardening settings you can add to your `/etc/postfix/main.conf`:
```conf