Exim questions (unexpected disconnection and Connection reset by peer)


Verified User
Dec 30, 2018
I have been running Exim for a while but today an email coming from my server was bounced. The email was send using Gmail which has the SMTP configured and the Delivery Status Notification given by Gmail was "550 No such recipient here". As I am sure the address exists I looked at the logs and found the following.

2020-01-22 09:49:01 SSL_write: (from mail-oln040092068028.outbound.protection.outlook.com (EUR02-HE1-obe.outbound.protection.outlook.com) []) syscall: Connection reset by peer
2020-01-22 09:51:37 H=mail-io1-f54.google.com [] X=TLS1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=no F=<contact@domain.com> A=plain:contact@domain.com rejected RCPT <recipient@anotherdomain.com>:
2020-01-22 09:51:37 H=mail-io1-f54.google.com [] incomplete transaction (QUIT) from <contact@domain.com>
I also see message like this a lot that worry me.

2020-01-22 23:50:47 H=([]) [] incomplete transaction (connection lost) from <somesender@somedomain.com>
2020-01-22 23:50:47 unexpected disconnection while reading SMTP command from ([]) [] (error: Connection reset by peer) D=2s
This is beyond my knowledge and I would appreciate if someone could explain what is going on.