Currently we are unable to receive email from certain gmail accounts. We do get 9 out of 10 messages from Gmail.com, the 1 out of ten leave a log of "Connected to 67.1xxx.xxx.xxx but connection died. (#4.4.2)" at MessageLabs. We have been all over Exchange 2007 and spent hours with MessageLabs tech support and nobody can identify the reason for this odd behavior.
Our environment, Cisco ASA firewall, Exchange 2007 EE, MessageLabs Spam Filtering, 4.5 m/b isp connection.
mtu on ASA is 1500 and we are not using any fixup
Anybody seen this before or have any thoughts as to what to check next???