I am trying to troubleshoot a problem we are having at a customer site. This particular customer is having issues with receiving OOO (Out of Office) replies from one specific client. This is a big problem for them as it delays a lot of work when then await replies from people who are offsite etc.
After troubleshooting on our customers side we have found that it is the BATV function of the Sonicwall E-mail Security gateway which causes these messages to be dropped. We do not see them as Junk etc, in the Email Security GUI but the admin on the client side has found these error messages in his maillogs:
Mailserver on client side:
552 Unable to process message: msg.1257926399.602572.29394 - error: recipient: firstname.lastname@example.org failed, reason: Giving up on 188.8.131.52. 550 5.7.5 BATV failed to verify
Mailgateway on client side:
error: recipient: email@example.com failed, reason: Giving up on 184.108.40.206. 550 5.7.5 BATV failed to verify
After i turn off the BATV setting in the Sonicwall E-mail Security gateway the OOO messages are delivered from the client. I am unable to figure out where this domain could be blacklisted or something to that extent. And ordinary messages are delivered from the clients domain as normal.
Has anyone experienced this on the Sonicwall E-mail security or could help point me in a direction for troubleshooting this issue?