Still having issues with my second EFA server.
I'm kinda stumped, it seems to have issues to some mail servers and not to others (all Exchange 2010 behind same firewall gear)
Not doing Cisco SMTP inspect
MTU have tried putting it down, tried even lowering to 900
Doing port sniff on mail server, EFA seems to start sending the email fine. The attachment sending process goes as 2 or 3 packets from EFA, 2 ACK from mail server, back and forth.
Then EFA just stops sending packets and the mail server sends 6 ACK packets but gets no response, then times out.
Tried using TCPDUMP but with how much it processes its hard to narrow down as to if EFA is getting the ACK from mail server