In my firewall Log I saw many connections from mailserver trying to do an Ident on port 113. It turns out that some mail server (e.g. Sendmail) do a ident lookup in their default configuration.
I know that Ident is easyly fakeable and so I hope a missing ident server will not block any email?
I've never heard of an anti-spam program checking with an ident server -- it probably is someone testing to see if it would be useful. The lack of an ident connection would certainly not cause any E-mail to be blocked (very few mailservers have ident running on them). IIRC, the ident server should return "administrator" for the mailserver connections (as that is the user that initiated the connection, since mailserver E-mail addresses may or may not have actual account on the server). A spammer could easily run ident servers to bypass this test.
Is there any sense to run an Ident Service?
For a mailserver, I would see no need for it.
-Scott
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