If you are using tcpwrappers (/etc/hosts.{allow,deny}) hosts.allow must contain a line like
ALL: 127.0.0.1
or
ALL: localhost.localdomain
in addition make sure /etc/mail/local-host-names contains
localhost localhost.domain myhost.mydomain.com ....
and finally make sure /etc/hosts contains
127.0.0.1 localhost.localdomain localhost
and not localhost.com
You can test using telnet to talk directly to the SMTP port 25 and seeing where the "converstation"with sendmail breaks down. The .... in the following would, of course be replaced with a bunch of SMTP verbage which should be reasonably helpful.
# telnet localhost 25 220 .... MAIL FROM: [EMAIL PROTECTED] .... OK RCPT TO: [EMAIL PROTECTED] .... OK DATA test
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