Hi people,
today i got email from one of our customers can't send email to our domain.
I checked firewall and i see that that email is allowed and try to be delivered every 10 minutes.
On exchange 2010 server (only one we have in house) i don't see any info of that email.
Can u help me diagnose the problem ?
Here is NDR for that email.
Dijagnostičke informacije za administratore:
Poslužitelj za generiranje: DB4PR01MB0767.eurprd01.prod.exchangelabs.com
Poslužitelj za primanje: DB4PR01MB0767.eurprd01.prod.exchangelabs.com
Total retry attempts: 274
sanja.anic@otpleasing.hr
7/9/2017 9:25:40 AM - Server at DB4PR01MB0767.eurprd01.prod.exchangelabs.com returned '550 5.4.318 Message expired, connection reset (SuspiciousRemoteServerError)(450 4.4.318 Connection was closed abruptly (SuspiciousRemoteServerError))'
7/9/2017 9:15:35 AM - Server at...
