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# Disable Sender Addresses Verification

## 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:

    docker-compose exec postfix-mailcow postmap /opt/postfix/conf/check_sasl_access

Restart the Postfix container.

Last update: 2022-02-02 10:57:04
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