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Trailing dot in the recipient address.
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Sciurus  
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 More options Aug 23 2007, 9:46 am
Newsgroups: comp.mail.sendmail
From: Sciurus <sciu...@mail.ru>
Date: Thu, 23 Aug 2007 06:46:29 -0700
Local: Thurs, Aug 23 2007 9:46 am
Subject: Trailing dot in the recipient address.
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I block mail with a trailing dot in the RCPT_TO field.
I use these rules, and they do well.
SLocal_check_rcpt
R<$...@mydomain.ru.>                  $#error $: "553 Trailing dot in
the recipient address."

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 u...@mydomain.ru is in the whitelist,
and mail is with u...@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 <postmas...@mydomain.ru.>; Sun, 15 Apr 2007 16:29:53 +0600
...
...
X-Spam-Flag: SKIP
X-Spam-Yversion: Spamooborona 1.5.2


 
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Per Hedeland  
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 More options Aug 23 2007, 6:22 pm
Newsgroups: comp.mail.sendmail
From: p...@hedeland.org (Per Hedeland)
Date: Thu, 23 Aug 2007 22:22:17 +0000 (UTC)
Local: Thurs, Aug 23 2007 6:22 pm
Subject: Re: Trailing dot in the recipient address.
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In article <1187876789.404392.187...@i13g2000prf.googlegroups.com>

Sciurus <sciu...@mail.ru> writes:
>I block mail with a trailing dot in the RCPT_TO field.
>I use these rules, and they do well.
>SLocal_check_rcpt
>R<$...@mydomain.ru.>                  $#error $: "553 Trailing dot in
>the recipient address."

>But does it break any RFC ?

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


 
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