But does it break any RFC ?
The reason of blocking is in the filter spamooborona whitelist.
Spamooborona works only for mailboxes listed in the whitelist.
So if mailbox us...@mydomain.ru is in the whitelist,
and mail is with us...@mydomain.ru. in the RCPT_TO,
spam will reach the user.
Received: from killersoft.com ([122.43.86.163])
by mail.mydoman.ru (8.13.6/8.13.6) with SMTP id l3FAToYq001563
for <postm...@mydomain.ru.>; Sun, 15 Apr 2007 16:29:53 +0600
...
...
X-Spam-Flag: SKIP
X-Spam-Yversion: Spamooborona 1.5.2
Not AFAIK - that is certainly not valid syntax for an email address.
Just be careful with the fact that sendmail.cf internally uses a
trailing dot to indicate "canonical domain part" - testing the RCPT
argument directly as you do should be fine, but if some standard ruleset
processing has been done you're likely to have a trailing dot on all
valid addresses (it is removed on "output" of course).
--Per Hedeland
p...@hedeland.org