I agree. UDP is preferred for DNS.
RFC calls for UDP + TCP access. Blocking TCP can cause some pretty obscure problems.
> would not open port 113. > Someone correct me if I'm wrong, but I don't believe it's necessary for > the operation of Imail!!
Port 113 probably does not need to be open for Imail's benefit. However, when Imail attempts to connect to another SMTP server, that remote server a great deal of the time
will attempt to IDENT Imail on port 113.
I've never heard of an MTA using IDENT to accept/refuse mail. A lot of security people have a hard time justifying why 113 is worth allowing access.
(It may also do a reverse DNS lookup on Imail, so that should be set up correctly.) If you go to Google and type in "smtp port 113", you will see thousands of links to sites explaining the need for port 113 to be open.
Half of what I saw were security concerns about port 113.
fwiw, I never run identd on IMGate servers and have never had any problems.
Len
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