Hello I have a SBS2008 completely updated (exchange sp3 with rollups).
Some (very few) senders from outside the domain cannot send to this server.
error that sender gets "retry timeout exceeded" but user exits on domain (I can send to it).
When I do a check with mxtoolbox I get a warning.
Analyzing SMTP Capabilities for server remote.domain.nl:25
Unabled to determine SMTP capabilities. Reason: Unexpected SMTP server response. Expected: 220, actual: 500, whole response: 500 5.3.3 Unrecognized command.
What can this be ??
The user from the domain can send to the sender.
regards, Marc
MarcH