Probleme with autoreply email

| OS type and version | Debian 11 last version |
| Webmin version | 2.013 |
| Virtualmin version | 7.5 |
| Related packages | postfix |


I’m writing to you because we are encountering a problem that has been present for a few days/weeks on new installations of Virtualmin.

When we create an e-mail box, it normally works in sending and receiving.

When we activate an automatic email reply, we receive the automatic message as well as a “Mail Delivery System” message with the following message:
This is the mail system at host …

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

<…net> (expanded from
<p.andriana@…>): unknown user: “

Could you reproduce this problem and try to help me to fix it please?

The installation is by default.

Thank you so much.


“Unknown User” indicates the mailbox doesn’t exist.


Yes, there is a bug in Virtualmin and @Jamie and I are working on fixing it.

The easiest way to fix this is to:

  1. Edit /etc/postfix/virtual:


    Replace with:	user\

    Run the following command:

    postmap -c /etc/postfix hash:/etc/postfix/virtual
  2. Edit /etc/alias:

    Find: \,"|/etc/webmin ....

    Replace with:

     user\ \user\,"|/etc/webmin ....

    Run the following command:

    postalias /etc/aliases

Sorry about that, we will fix this on the next Virtualmin release.

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