Disabling the SMTP Fixup Protocol at the firewall disables ESMTP and allows only SMTP
Anyone using Imail peering will not be able to disable ESMTP
Does that mean that Cisco firewalls can't be set up not to interfere with SMTP transactions?
If enabling the "fixup" protocol breaks RFC-compliance and doesn't do all that it is supposed to, and disabling it disables SMTP AUTH, those firewalls need to be thrown out.
-Scott
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