[pfx] Re: warning: /usr/lib/postfix/sbin/virtual: bad command startup -- throttling

Hello,

2026-05-24T00:51:43.849893-07:00 B914839 postfix/virtual[42763]: fatal: 
bad string length 0 < 1: virtual_mailbox_base =
2026-05-24T00:51:44.850538-07:00 B914839 postfix/master[1714]: warning: 
process /usr/lib/postfix/sbin/virtual pid 42763 exit status 1
2026-05-24T00:51:44.850691-07:00 B914839 postfix/master[1714]: warning: 
/usr/lib/postfix/sbin/virtual: bad command startup -- throttling

Note that I have since then added to main.cf:

virtual_mailbox_base = /var/lib/vmail

But I'm not sure why it is needed if it has no impact on mail delivery 
but the error has gone away.

Viktor Dukhovni: The error is gone by adding the above configuration.
Viktor Dukhovni: The virtual process appears to be failing but 
everything is virtual, not local.  I am using LMTP if that makes a 
difference.

postconf reveals:
local_transport = local:$myhostname
relay_transport = relay

Regards,
David Koski
[email protected]

On 5/15/26 5:06 PM, Wietse Venema via Postfix-users wrote:
> Wietse Venema via Postfix-users:
>> David Koski via Postfix-users:
>>> Hello,
>>>
>>> I'm using Dovecot LMTP (dovecot-mysql) for local delivery for Postfix
>>> (postfix-mysql) so the local delivery destination is stored in the MySQL
>>> database.? Now I'm getting an error:
>>>
>>> warning: /usr/lib/postfix/sbin/virtual: bad command startup -- throttling
>> Please show the complete logfile record.
> And the logging from the "virtual" process immediately before this.
>
> 	Wietse
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