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From: Magnus Hagander <[email protected]>
To: Tobias Bussmann <[email protected]>
Cc: [email protected]
Subject: Re: Images in news mails
Date: Wed, 7 Jan 2026 21:46:18 +0100
Message-ID: <CABUevExfO2oP=h==31c1XM=OsiCc4tbSGZorJ-V3EwAbNaAJBQ@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Thu, 4 Sept 2025 at 21:49, Tobias Bussmann <[email protected]> wrote:

> Ever since HTML emails were introduced for project news in around 2020, I
> have wondered why, on my system (macOS using Apple Mail as the MUA), emails
> were sometimes displayed in a distorted way. Today, I took the time to
> track it down. Apple Mail ignores the size if the image source is provided
> inline via CID and not referenced externally [2, footnote 3]. As a
> workaround, the width can be specified again in the 'style' tag, as I have
> done in the attached patch.
>
> Another issue is that the Slonik logo is displayed again at the end of the
> email. In contrast to the first issue, this affects the Mail app on iOS as
> well. My analysis suggests that this is caused by the MIME structure of the
> email:
> - multipart/mixed
>   - multipart/alternative
>     - text/plain
>     - text/html
>   - image/png with Content-Disposition: inline
>
> This issue is resolved if I change the structure to the following:
> - multipart/alternative
>   - text/plain
>   - multipart/related
>     - text/html
>     - image/png with Content-Disposition: inline
>
>
Wow, this was a lot of fun. Not.

I have changed the code to restructure like this and it mostly works. It
now breaks in the gmail app on android when connected to our company
emulated-exchange interface. But it fixes apple mail. I think there are a
lot more apple mail out there, so I think it's a strict improvement :)

Thanks for the diagnosing work! I hope this does properly fix it!

//Magnus

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