mailcow-dockerized-docs/docs/manual-guides/Postfix/u_e-postfix-disable_sender_verification.en.md

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## New guide
Edit a mailbox and select "Allow to send as *".
For historical reasons we kept the old and deprecated guide below:
## Deprecated guide (DO NOT USE ON NEWER MAILCOWS!)
This option is not best-practice and should only be implemented when there is no other option available to achieve whatever you are trying to do.
Simply create a file `data/conf/postfix/check_sasl_access` and enter the following content. This user must exist in your installation and needs to authenticate before sending mail.
```
user-to-allow-everything@example.com OK
```
Open `data/conf/postfix/main.cf` and find `smtpd_sender_restrictions`. Prepend `check_sasl_access hash:/opt/postfix/conf/check_sasl_access` like this:
```
smtpd_sender_restrictions = check_sasl_access hash:/opt/postfix/conf/check_sasl_access reject_authenticated_sender_login_mismatch [...]
```
Run postmap on check_sasl_access:
```
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docker compose exec postfix-mailcow postmap /opt/postfix/conf/check_sasl_access
```
Restart the Postfix container.