[horde] Mails sent from Horde identified as spam on the sending server

[Volker Then]

Quoting Simon B <simon.buongiorno at gmail.com>:

> On 1 Sep 2016 14:47, "Volker Then" <horde40 at volkerthen.com> wrote:
>>
>> Hi,
>>
>> some of my messages sent with horde (webinterface or ActiveSync client)
> get already filtered as spam by the local spamassassin instance:
>>
>> Content analysis details:   (5.5 points, 5.0 required)
>>
>>  pts rule name              description
>> ---- ----------------------
> --------------------------------------------------
>>  3.6 RCVD_IN_PBL            RBL: Received via a relay in Spamhaus PBL
>>                             [80.131.175.177 listed in zen.spamhaus.org]
>>  0.2 CK_HELO_GENERIC        Relay used name indicative of a Dynamic Pool
> or
>>                             Generic rPTR
>>  1.6 RCVD_IN_BRBL_LASTEXT   RBL: No description available.
>>                             [80.131.175.177 listed in
> bb.barracudacentral.org]
>>
>> It is due to the Received-from header in the horde emails:
>>
>> Received: from p5083AFB1.dip0.t-ipconnect.de (
> p5083AFB1.dip0.t-ipconnect.de
>>  [80.131.175.177]) by ********* (Horde Framework) with HTTPS; Thu, 01
>>
>> It is weird that the client is identified as a relay, it shouldn't be
> like this. Is that more an issue of a wrongly configured spamassassin or
> can that be fixed by horde itself, by omitting the client specific
> received-header? If yes, how would I do that?
>>
>> I have that issue now with almost any dynamic client IP.
>>
>> Regards and thanks in advance,
>
> All this means is the dynamic IP assigned to the client has previously been
> blocked and reported to spamhaus.
>
> Since that is where the mail originated from and not the ActiveSync/webmail
> server it would be intellectually dishonest for the mail headers not to
> show that.
>
> Your use should complain to the ISP (Telekom) and obtain a new an clean IP.
>

Thanks Simon, I agree completely. For now I deactivated spamassassin's  
rbl checks.

skip_rbl_checks 1

But it's not only an issue of Telekom. Same problem occured today with  
O2 mobile. And last week I stayed in the Czech Republic and had the  
same issues with the local O2. Another problem was that my  
girlfriend's ISP has no reverse mapping of IP addresses which resulted  
in a spam score as well.

I just start wondering if my phone is infected with something and of  
that all IP addresses I obtain are affected. But I doubt that. ;-)