Encoding problem subscription email

[sbien]

Hello,

I am running a phpbb forum that I have updated to the latest version on monday. Since then, I received a message from a user stating that the email they got from their topic subscription looks strange. I asked them to forward the email to me and have been trying to figure out what the problem is. It seems that for long topic titles, the subscription email switches encoding halfway during the subject line and this messes up the whole email header. I have replicated this myself, it seems to happen after 25 characters in the title. The weird thing is, it doesn't happen for every topic above 25 characters, since almost all topic titles are longer than that. We have yet to find for how many characters exactly..

I have no idea what caused this, and I'm not even sure this happened during updating to latest version, could be that it was happening before.

Phpbb 3.3.5, language pack is Dutch (casual honorifics)

Edit - additional info: we use our own smtp server to send the mail. Sending a link of the affected topic by mail doesnt show the problem

Screenshot


Subjectline

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Nieuwe reactie in onderwerp - "Labrador Sam op bizarre w =?US-ASCII?Q?ijze ziek geworden =

Email body

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van staalsplinters onkruidborstels?=
=?US-ASCII?Q?."?=
To: =?US-ASCII?Q?testsabine123?= <[email protected]>
From: "=?US-ASCII?Q?Een Hondenleven?=" <[email protected]>
Reply-To: "=?US-ASCII?Q?Een Hondenleven?=" <[email protected]>
Return-Path: <[email protected]>
Sender: <[email protected]>
MIME-Version: 1.0
Message-ID: <[email protected]>
Date: Tue, 26 Oct 2021 22:35:43 +0200
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: phpBB3
X-MimeOLE: phpBB3
X-phpBB-Origin: phpbb://www.eenhondenleven.com
List-Unsubscribe: <https://www.eenhondenleven.com/viewtopic.php?uid=442&t=1017&unwatch=topic>

Hallo testsabine123,

Je ontvangt dit bericht omdat je op een onderwerp bent geabonneerd,
"Labrador Sam op bizarre wijze ziek geworden van staalsplinters
onkruidborstels." op Een Hondenleven. Dit onderwerp heeft een nieuwe
reactie van sabine sinds je laatste bezoek. Er worden geen nieuwe meldingen
verzonden totdat je het onderwerp weer hebt bezocht.

Als je het nieuwste bericht wil bekijken, klik op de volgende link:
https://www.eenhondenleven.com/viewtopic.php?t=1017&e=1&view=unread#unread

Als je het onderwerp wil bekijken, klik op de volgende link:
https://www.eenhondenleven.com/viewtopic.php?t=1017

Als je het forum wil bekijken, klik op de volgende link:
https://www.eenhondenleven.com/viewforum.php?f=7

Als je niet langer meer geabonneerd wil zijn op dit onderwerp, klik dan op
de "Uitschrijven onderwerp" link bovenaan of onderaan het onderwerp, of
door te klikken op de volgende link:
https://www.eenhondenleven.com/viewtopic.php?uid=442&t=1017&unwatch=topic

-- 
Team EenHondenleven.com

[janus_zonstraal]

Is also reported here: viewtopic.php?p=15770556#p15770556
And I have sometimes the same thing.
Maybe the same host? I'm with Vimexx.

[sbien]

I have turned off our smtp server and when using the built-in board email, there is no encoding issues, however, there are ='s added to the topic title. I suspect these trigger some encoding on our smtp server, but I would be more interested in why they're added in the first place

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Nieuwe reactie in onderwerp - "Supermegalangetitel om te testen wat er nou =eigenlijk in den godensnaam mis gaat met de mails van abonnementen??? waaro=m"

Is also reported here: viewtopic.php?p=15770556#p15770556
And I have sometimes the same thing.
Maybe the same host? I'm with Vimexx.

Nope, different host

[3Di]

You can disable sending in ASCII and restore UTF-8 by adding a line of code in

includes/functions_messenger.php

search (1857)
$is_ascii = strlen($str) === utf8_strlen($str);

Add the following on a new line
$is_ascii = false;

It's just a workaround, but it should work with smtp server.

[sbien]

You can disable sending in ASCII and restore UTF-8 by adding a line of code in

includes/functions_messenger.php

search (1857)
$is_ascii = strlen($str) === utf8_strlen($str);

Add the following on a new line
$is_ascii = false;

It's just a workaround, but it should work with smtp server.

Thank you, I will try this

[3Di]

Thank you, I will try this

I left a comment in the tracker: https://tracker.phpbb.com/browse/PHPBB3 ... ment-64640