Why are we having problems sending SMTP mail?

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"The mail gateway is generating the following error when a connection is attempted from the outside on port 25(SMTP): Host is listed in reverse DNS lookup".
When this occurs, change the NAT rule from VNAT (VirtualNAT) to a one-to-many rule.  Make sure that a corresponding Vector Map rule is also created for the mail servers address with port 25 specified.

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