I have a very strange situation where my Exchange Server 2010 can't receive any gmails with attachment size over 50KB. It has zero problems with all other e-mails coming in except hosted by gmail.com. I can receive plain gmails, or with attachment up to 50KB. Anytime a gmail with attachment bigger than 50KB, it will show:
Failed connection to 2001:4860:400b:c01::1a (NetworkUnreachable:00002743)[TargetIPAddress:2001:4860:400b:c01::1a|MarkedUnhealthy|FailureCount:1|NextRetryTime:2015-02-26T22:00:58.693Z] I involved my Cisco TAC to confirm that my ASA5505 is not dropping/denying any SMTP traffic. Pretty much checked all firewall rules. Absolutely puzzled! Anybody got any ideas? |