Thank you so much!
[quote=“Simon_Cossar, post:2, topic:40160”]
display_src = "#{src_uri.scheme || 'https://'}#{src_uri.host}#{src_uri.path}"
```[/quote]
This is the culprit and generated the incorrect `httpspseuco.com`-link. I think this is a general bug and [proposed a fix](https://github.com/discourse/discourse/pull/4042) – with this, my emails should at least look okay.