sure, that's what i find in my log:
refused: Dynamic IP Addresses See: 451 http://www.sorbs.net/lookup.shtml?ip

that's what i get if i don't use a mailserver:
Dec 16 12:53:04 my-computers-hostname postfix/smtp[32033]: 231904AAE8: to=<cpan-testers@perl.org>, relay=mx.develooper.com[63.251.223.176], delay=432669, status=deferred (host mx.develooper.com[63.251.223.176] said: 450 Could not resolve my-computers-hostname.local (in reply to MAIL FROM command))

In reply to Re^2: CPAN::Reporter and SMTP-server by tinita
in thread CPAN::Reporter and SMTP-server by tinita

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