I see your name and them from Frédéric with the correct spelling. This is in thunderbird. Are you sure it's not a your side issue ?

I can confire the issue (using kmail here)

From: "andrXX blais" <bugzilla-daemon@mageia.org>

I use seamonkey for email, essentially identical to thunderbird.
I see the same problem if I access my email via the web instead of POP3.

Maybe it is an issue with how bugs.mageia.org interacts with laposte.net ?

Note that laposte.net is an email service for the francophone world, so accents are common, and that only the bugs.mageia.org list is affected.
Other mageia mailing lists (dev, discuss, doc-discuss, qa-discuss) are correct.

For me, in Thunderbird, Frédéric and André are shown correctly.

However, the Å of MichaÅ Wernicki and the à of Ãric Barrat are shown as white question marks on a black diamond

In the sources I see

From: "Micha� Wernicki" <bugzilla-daemon@mageia.org>
From: "�ric Barrat" <bugzilla-daemon@mageia.org>
From: "andré blais" <bugzilla-daemon@mageia.org>
From: "Frédéric Buclin" <bugzilla-daemon@mageia.org>

but there are *warnings*:

X-Amavis-Alert: BAD HEADER SECTION, Non-encoded 8-bit data (char C5 hex):
	From: "Micha\305\202 Wernicki" <bu[...]
X-Amavis-Alert: BAD HEADER SECTION, Non-encoded 8-bit data (char C3 hex):
	From: "\303\211ric Barrat" <b[...]
X-Amavis-Alert: BAD HEADER SECTION, Non-encoded 8-bit data (char C3 hex):
	From: "Fr\303\251d\303\251ric Buclin"[...]
X-Amavis-Alert: BAD HEADER SECTION, Non-encoded 8-bit data (char C3 hex):
	From: "andr\303\251 blais" <bugzi[...]

CC: (none) => marja11

I see what is happening :

The bugs.mageia.org list is encoding the headings as utf-8, without specifying the encoding, and laposte.net is replacing the utf-8 code outside the ascii range with X.  So those using laposte.net see X in place of accents.

Other email servers are not replacing the utf-8 encoding, so email agents such as thunderbird or kmail are able to correctly display the utf-8.

The error messages that Marja sees seem to be generated by Mageia, and are passed by laposte.net because they aren't in the sender field.
(I see them in the source as well)

Other mageia mailing lists use encoding as follows :

acute accent in dev list :
From: =?ISO-8859-1?Q?Pierre-Malo_Deni=E9lou?= <pierre-malo.denielou@rhul.ac.uk>

chinese characters in dev list :
From: =?GB2312?B?zfW17r34?= <1132321739qq@gmail.com>

arabic letters in discuss list :
From: =?windows-1256?B?x+Hj08fh4yDH4ePTx+HjyQ==?=
	<almusalimalmusalimah@gmail.com>

The encoding is explicitly specified, so laposte.net accepts it and properly displays the accented characters

So I expect that the solution is to specify utf-8 encoding if it applies ?

I emailed dmorgan a fix for the Mageia extension. It fixes the problem for me using Thunderbird. Up to him to install the updated extension.

Assignee: LpSolit => dmorganec

dmorgan: ping? Did you update the Mageia extension?

The warning is still there:
X-Amavis-Alert: BAD HEADER SECTION, Non-encoded 8-bit data (char C3 hex):
	From: "Atilla \303\226NTA\305\236" <bugzil[...]
<snip>
Tue, 15 Jul 2014 22:15:08 +0200 (CEST)
From: "Atilla �NTA�" <bugzilla-daemon@mageia.org>


The others show fine here, in spite of the warning:

X-Amavis-Alert: BAD HEADER SECTION, Non-encoded 8-bit data (char C3 hex):
	From: "Fr\303\251d\303\251ric Buclin"[...]
<snip>
Sun, 20 Jul 2014 00:52:25 +0200 (CEST)
From: "Frédéric Buclin" <bugzilla-daemon@mageia.org>

CC'ing Colin, he solved a similar issue with git commit hooks in #12374.

CC: (none) => mageia, remi

This problem is fixed in Bugzilla 5.0.2.

Problem fixed, AFAIK.

Status: ASSIGNED => RESOLVED
Assignee: dmorganec => sysadmin-bugs
Resolution: (none) => FIXED

It was fixed for me since 2014-11-21 or before.
Still saw error 2014-09-27