<!DOCTYPE html><html><head>
<meta http-equiv="Content-Type" content="text/xhtml; charset=UTF-8"/>
</head>
<body><div style="font-family: sans-serif;"><div class="markdown" style="white-space: normal;">
<p dir="auto">Quick follow-up: I tried using Thunderbird with ProtonMail Bridge, and the same inline image test case works fine. Thunderbird uses <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">Disposition: inline</code>, and the <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">Content-ID</code> is retained as you would expect.</p>
<p dir="auto">Can we have MailMate do the same?</p>
<p dir="auto">On 24 Feb 2025, at 12:06, Oli Sturm via mailmate wrote:</p>
</div><blockquote class="embedded" style="margin: 0 0 5px; padding-left: 5px; border-left: 2px solid #777777; color: #777777;"><div id="8B6A5672-CB4F-46A3-B0BB-E3760CD4790E">
<div style="font-family: sans-serif;">
<div class="markdown" style="white-space: normal;">
<p dir="auto">Hi,</p>
<p dir="auto">I’m using ProtonMail Bridge and I see some odd behavior with MailMate. One strange thing is that during its detailed reformatting of messages, ProtonMail (PM) seems to drop the <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">Content-ID</code> properties of inline images, which breaks the <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">img src</code> attributes in the HTML parts, so that these images are not displayed on the recipient’s side.</p>
<p dir="auto">When I cross-checked what PM itself generates when I send a similar email, I found that they use <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">Content-Disposition: inline</code> for inline images… which makes good sense to me. I wonder whether the Content-IDs are dropped by their system in cases where the disposition is <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">attachment</code>, but preserved for disposition <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">inline</code>.</p>
<p dir="auto">And I wonder why MailMate doesn’t use <code style="margin: 0 0; padding: 0 0.25em; border-radius: 3px; background-color: #F7F7F7;">inline</code> where it seems to make very good sense to do so. I’m no RFC guru in these areas, so I may well be completely wrong here… but is there any chance there could be an MM bug here, or at least a situation where an option may be provided in case it helps compatibility?</p>
<p dir="auto">Thanks<br/>
Oli</p>
</div>
</div></div></blockquote>
<div class="markdown" style="white-space: normal;">
</div>
</div>
</body></html>