Email: can send from, but not receive

FBX version is latest update, running on Debian Bullseye.

Can send email, but cannot receive. Instead the logs say:

Error: lmtp-server: conn unix:pid=69135,uid=124 [1]: rcpt Failed to initialize user: Mail access for users with UID 10001 not permitted (see first_valid_uid in config file, uid from userdb lookup).
Temporary internal error (in reply to end of DATA command)

The first_valid_uid in config file is 500, so 10001 seems … odd?

Any help would be much appreciated!

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This issue has been confirmed on IRC. Let’s wait for more information and/or requests from the developers.

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I have a fix available for this issue:

Please try this fix:


base = dc=thisbox

in the file:


Then restart dovecot:

systemctl restart dovecot.service

Let me know if the fix works.

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