I use dovecot-lmtp and postfix. When I send e-mail to 2 recipients (or more) at the same time and if one of them is over quota (or under quota and the message I send is bigger than his free space) mailq shows:
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient------- 20B03336F22 26099 Thu Apr 19 18:02:47 support@example.com (lost connection with server25.example.org[private/dovecot-lmtp] while sending end of data -- message may be sent more than once) user1@example.com user2@example.com
E-mails sent from the same domain on same server so it's a local delivery.
If I send the e-mail to the over quota user ( only him on To: ) then I get a bounce that says that user is over quota which is the correct behaviour.
I think the problem started after I upgrade dovecot-2.2.35 to dovecot-2.3.1.
Is this a known bug?