forge@softwareheritage.org: Recipient address rejected: User unknown in virtual mailbox table

Hi,

when replying to mails from Phabricator (Reply-To: all), I get the below error message from my outgoing MTA:

This is the mail system at host fregna.das-netzwerkteam.de.

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

<forge@softwareheritage.org>: host spool.mail.gandi.net[217.70.178.1] said: 550
    5.1.1 <forge@softwareheritage.org>: Recipient address rejected: User
    unknown in virtual mailbox table (in reply to RCPT TO command)

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Migrated from T1965 (view on Phabricator)