The firewall has been in place for some time working great. We recently began testing an internal mail server. It has been tested internally fine. It can also send mail externally fine. However, even though we have opened up the SMTP port everywhere in the firewall, when you send mail outside to the machine, sendmail gets it into the mail queue but then the message is deferred since it cannot talk back through the firewall. The error message reads "(Deferred: Connection timed out with XXX.XXX.XXX.XXX.)" where the XXX's are the firewall real-world IP address. The port forwarding is also set up on the SMTP port. We have checked through the config and found nothing that helps. Please advise.
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