We have a customer who can't seem to
send to a domain that uses the Cisco Ironport. It just disconnects our
We are listed as "good" on the
senderbase.org database. Has anyone have any experience with this
problem? Is it possible that each Ironport checks its own send/receive
symmetry. I suspect (99% sure) that our customer sends to this
Ironport on a regular basis but that the recipient replies back using
another smtp server. As soon as the "postmaster" from this domain
started emailing me regarding this issue, the emails are going
through. (I suspect thus balancing the send/receive symmetry)
Am I on the right track or not?
The "postmaster" claims his
applience does not do any checking at all...... But if I am right the
problem will be back as soon as the postmaster/support stops emailing
Thanks in advance.
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