[stragies]

Hmm, I wonder, if roundcube was the exception (w.r.t feImage), or if soon other webmail clients will need to be patched

[nullcathedral]

Author here! I have looked at Thunderbird. I'll go and look at some others as well, should have probably done that earlier.

[zimpenfish]

I wouldn't vouch 100% for my PHP understanding but it looks like SnappyMail removes `<svg>` elements entirely (`BuildHtml` in `snappymail/v/2.38.2/app/libraries/MailSo/Base/HtmlUtils.php`)