[TYPO3-english] eMail Subject Encoding Problem

[Oliver Salzburg]

Hi guys,

I hope I picked the right list for this issue.
I'm fairly new to Typo3 so please bare with me.

I started using the extension sp_bettercontact for a contact form on a
site I'm currently working on. I noticed that the mails that were sent
out had strangely encoded subject lines, like so:

=?utf-8?Q?Oliver_Salzburg_hat_eine_Nachricht_versandt?=

Which is obviously quoted-printable encoding (the rest of the message
is just fine by the way).
So I inspected the "source" of such an email and it shows this subject:

Subject: =?utf-8?Q?=3D=3Futf-8=3FQ=3F=0AOliver=5FSalzburg=5Fhat=5Fe?=
  =?utf-8?Q?ine=5FNachricht=5Fversandt=3F=3D?=

So, it looks like the subject is encoded multiple times (and,
obviously, only decoded once).

This sent me on a wild hunt through the source of both the extension
and the mail framework of Typo3 and I soon realized I could fix me
problem by setting dontEncodeHeader on the t3lib_htmlmail instance to
true.

Doing so will produce the following code in the mail:

Subject: =?utf-8?Q??=
  =?utf-8?Q?Oliver?= Salzburg hat eine Nachricht =?utf-8?Q?versandt=0D?=

Which still looks a bit weird to me but is decoded correctly in all
clients that I've tried (Outlook and Thunderbird).

What is actually going wrong here? Do I need to adjust that extension
by setting dontEncodeHeader? I would assume the author would have
realized it if that setting was required.

Any advice would be greatly appreciated.

p.s.: I mailed the author of the extension several hours ago, but he,
sadly, didn't reply yet.