The mailing list for listmasters using Sympa

[David Verdin <address@concealed>]

Yes, That html-only reception mode is really a reflection from the past. 
We should remove it, it is meaningless now. And it is a source of 
problems, too.

Regards,

David


On 01/11/2017 09:47, Xand Meaden wrote:
> Thanks Paul and Jan. That does seem to be the trigger - setting the list
> to HTML-only mode, and then sending an HTML message with the attachment:
> the attachment is removed. Interestingly if the message is plain text,
> both it and the attachment are successfully delivered!
>
> Regards,
> Xand
>
> On 01/11/17 08:08, Engels, Jan wrote:
> > Hi,
> >
> > yes, we've also experienced this problem with the 'html-only' setting. The 
> > problem seems to
> > be related with the encoding/structure of the raw e-mail and not with the 
> > attachments themselves.
> > I could successfully re-send an email to the same mailing list with the exact 
> > same attachment (pdf) that
> > was previously ripped off by sympa. The problem only ocurred when re-sending 
> > the exact same raw e-mail.
> > Unfortunately I was not able to find what exactly is causing the problem :(
> >
> > Below (between ##### ) you can find the headers of such an e-mail (with all 
> > sensitive information removed).
> >
> > The pdf from this e-mail got ripped off by sympa but it could still be found 
> > in the sympa archive from this
> > list.
> >
> > Hope this helps.
> >
> > Cheers
> > Jan
> >
> > #####################
> >
> > Date: Mon, 31 Jul 2017 15:50:14 +0200 (CEST)
> > From: "..." <...@...>
> > To: ... <...@...>
> > Message-ID: <...@...>
> > In-Reply-To: <...@...>
> > References: <...@...>
> > MIME-Version: 1.0
> > Content-Type: multipart/mixed;
> >         boundary="----=_Part_3551695_666232279.1501509014903"
> > X-Mailer: ...
> > Thread-Topic: ...no 3 (test with pdf attachment)
> > Thread-Index: AdMBTEO3K4TdIWxfTrypMhhV47mvpVMDYMRb
> > Subject: [...] ...no 3 (test with pdf attachment)
> > Reply-To: ...@...,"..." <...@...>
> > X-Loop: ...@...
> > Errors-To: ...@...
> > Precedence: list
> > Precedence: bulk
> > Sender: ...@...
> > X-no-archive: yes
> > List-Id: <...@...>
> > List-Help: <mailto:address@concealed?subject=help>
> > List-Subscribe: <mailto:address@concealed?subject=subscribe%20...>
> > List-Unsubscribe: <mailto:address@concealed?subject=unsubscribe%20...>
> > List-Post: <mailto:...@desy.de>
> > List-Owner: <mailto:...@desy.de>
> > List-Archive: <https://.../sympa/arc/...>
> > Archived-At: <https://.../sympa/arcsearch_id/.../2017-08/...>
> >
> > ------=_Part_3551695_666232279.1501509014903
> > Content-Type: multipart/alternative;
> >         boundary="=_f6d1ac49-4489-4cc0-9920-ced94fb285f4"
> >
> > --=_f6d1ac49-4489-4cc0-9920-ced94fb285f4
> > Content-Type: text/plain; charset=utf-8
> > Content-Transfer-Encoding: quoted-printable
> > ...
> > ...
> > ...
> > --=_f6d1ac49-4489-4cc0-9920-ced94fb285f4
> > Content-Type: text/html; charset=utf-8
> > Content-Transfer-Encoding: quoted-printable
> >
> > --=_f6d1ac49-4489-4cc0-9920-ced94fb285f4--
> >
> > ------=_Part_3551695_666232279.1501509014903
> > Content-Type: application/pdf; name="....pdf"
> > Content-Disposition: attachment;
> >   filename=....pdf"
> > Content-Transfer-Encoding: base64
> > ...
> > ...
> > ...
> > ------=_Part_3551695_666232279.1501509014903--
> >
> > #####################
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > | From: "Paul Barton" <address@concealed>
> > | To: address@concealed
> > | Sent: Tuesday, 31 October, 2017 20:28:20
> > | Subject: Re: [sympa-users] Attachments removed from messages
> >
> > | Check to see if the list in question is set to 'html-only' for either
> > | the default reception or even on a per-subscriber basis. We found that
> > | PDF attachments from Gmail senders often get blocked if a
> > | list/subscriber is html-only since PDF's aren't HTML.
> > |
> > | -Paul
> > |
> > | * address@concealed (address@concealed) wrote:
> > |> We are running Sympa 6.2.22, though this problem started before the latest
> > |> upgrade. Users have reported to us that some of the attachments being sent 
> > to
> > |> their mailing lists are being mysteriously removed from the message the
> > |> subscribers receive. The same thing can happen with inline images.
> > |>
> > |> We have a large number (several thousand) of mailing lists and the problem
> > |> seems to affect different lists at random. Also, if the missing attachment 
> > is
> > |> re-sent to the same list a few minutes later, it will usually be 
> > delivered, so
> > |> it's very hard for us to reproduce. When viewing the Archive for that 
> > mailing
> > |> list, the attachment is there. We have compared the Exim MTA logs (running 
> > on
> > |> the Sympa server) and can see the size of the outgoing message is much 
> > smaller
> > |> than the one that arrives - so it is not some external system removing the
> > |> attachments.
> > |>
> > |> I wonder if anyone has experienced this issue or has any suggestions?
> > |>
> > |> Thanks,
> > |> Xand
> > |>
> > |> --
> > |> Xand Meaden | Server Infrastructure Officer
> > |> IT Development, Information Services, University of Kent
> > |> Room S21, Cornwallis South
> > |> Canterbury, Kent, CT2 7NF, UK
> > |>
> > |> www.kent.ac.uk/itservices | @UnikentUnseenIT
> > |
> > | --
> > | Paul Barton <address@concealed>
> > | Lead Linux Systems Administrator

--
"Mieux vaut viser la perfection et la rater que viser la médiocrité et 
l'atteindre."
- Francis Blanche

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