[Dovecot] RFE: please add Return-Path: to sieve sent mail headers

[Reindl Harald]

Am 18.05.2014 00:22, schrieb Stan Hoeppner:
> On 5/17/2014 6:14 AM, Charles Marcus wrote:
> ...
>> The reality is that the RFCs mandate that the null sender envelope
>> address is one that must be accepted, as there are many things smtp
>> that depend on it.
> ...
> 
> Spammers tried to take advantage of null sender handling en masse many
> years ago and had little success with it.  Receivers rejected the
> messages by standard anti-spam mechanisms such as non existent PTR,
> dnsbls, content filters, etc.  And in fact some spammers still try to
> use null sender today.  Recent examples from Chinese IP space sending
> spam to messages IDs scraped from mailing list archives, clearly a spam
> bot infected PC:
> 
>> Apr 29 22:32:52 greer postfix/smtpd[4968]: NOQUEUE: reject: RCPT from unknown[14.148.130.120]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [14.148.130.120]; from=<> to=<4D18F665.6090709 at hardwarefreak.com> proto=ESMTP helo=<a01>
>> Apr 29 22:32:52 greer postfix/smtpd[4967]: NOQUEUE: reject: RCPT from unknown[14.148.130.120]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [14.148.130.120]; from=<> to=<4D18F04D.3040604 at hardwarefreak.com> proto=ESMTP helo=<a01>
> 
> Check your mail logs and you'll likely find such rejections of null
> sender as well.
> 
> Certainly one should never reject mail based on the presence of the null
> sender address, but by no means should anyone have a blanket accept
> policy based on the mere existence of the null sender address

nobody said that - even not what you quoted above

it only says you must not reject all messages based on the fact
there is a null-sender in use and that is why using anything
else than a null-sender for autoreplies and try to excuse that
by clueless fools blocking all null-senders is only silly


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