Problem with Return-Path from certain ISPs

[Ricardo Branco]

If I take MS out the loop then its all ok, this is the main turning 
point to indicate MS as being the culprit in this.

I think that Hotmail is adding the Return-Path for some reason and then 
MS has code to detect it and reconstitute the header for when it needs 
to add extra headers etc.., its at this point that its going wrong and 
it fails to add a new one, clearly its MS and not sendmail in this 
particular case due to my prior remark.

Jethro R Binks wrote, On 11/12/2009 11:31:
> On Fri, 11 Dec 2009, Ricardo Branco wrote:
>
>    
>> Ive been able to reproduce this again and again, not only with Hotmail.
>>
>> It seems that if the sending MTA (ie Hotmail) supplies a Return-Path
>> then for some reason its taken out.
>>
>> I think there is a bug in MailScanner/Sendmail.pm arround line 352
>>
>> I tested this by telnetting to my mail server and in the DATA section
>> putting a returnpath and it then did not end up on the final headers,
>> but if i dont put it then its there.
>>      
> The Return-Path: header should ONLY be added by the final receiving
> server, at the point of delivery to the mailbox (in its role as MDA).
> Its value is copied from the envelope sender address as received by the
> delivering server.  It should not be present on messages in-transit before
> that point, so it is not inappropriate for it to be removed as it is
> untrusted information -- if MailScanner is indeed doing so.
>
> Perhaps Sendmail, or Dovecot's LDA, are not adding the header when they
> should?
>
> Jethro.
>
>
>    
>> Ricardo Branco wrote, On 03/12/2009 15:00:
>>      
>>> Centos+MailScanner+Sendmail+DovecotLDA
>>>
>>> We started noticing issues with return-path not being passed though to
>>> Sendmail/DovecotLDA. This causes a knock on affect on Sieve filters in
>>> DovecotLDA which rely on Return-Path being passed though.
>>>
>>> If I take MailScanner out the loop then all is well, Return-Path
>>> exists to my mailbox, but if MS is running then it does not come
>>> through.
>>>
>>> Any reason why this would be happening?
>>>        
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>>      
> .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
> Jethro R Binks
> Computing Officer, IT Services, University Of Strathclyde, Glasgow, UK
>