Missing titles in tickets created by mail

[vatixxx]

Infos:

Important:
If you are a Zammad Support or hosted customer and experience a technical issue, please refer to: support@zammad.com using your zammad-hostname / or company contract.

• Used Zammad version: Zammada 2.5.x
• Used Zammad installation source: (source, package, …)
• Operating system: Linux
• Browser + version: Firefox

Expected behavior:

• Sending mail to our support mail creating ticket with number and title from email title.

Actual behavior:

• Sended mail was creating ticket but without title.

Steps to reproduce the behavior:

?
*

[MrGeneration]

Is it possible to share such a mail with especially headers?
Please ensure that personal information is removed before you upload it

[vatixxx]

To: IT <XXX@lXXX.XXX.pl>
From: =?UTF-8?Q?XX_K=c5=82eXXk?= <XXX@XXX.XXX.pl>
Subject: test
Message-ID: <add5194d-ffe4-0d11-ae3d-42e56903482b@XXX.pl>
Date: Mon, 17 Sep 2018 10:05:15 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
Thunderbird/52.9.1
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Content-Language: en-US

test ticket for title

It should create ticket with subject = title of ticket
but it create ticket with - in title. Example:

[dvnkln]

Could you try anything else besides “test” for the subject?

[MrGeneration]

Test should work.
You don’t happen to have triggers or filters manipulating the subjects?
The headers look perfectly fine.

[vatixxx]

I was thinking about that, but when I disable all of triggers and filtres nothing changed

[vatixxx]

I’ve got big mail(10MB) in queue, because one client send in reply 4K BMP file…
When it comes into ticket, titles creating normally. Everything works fine.
But why it was downloading for 4 days…