Thanks for the patch! I've installed SOGo 4.0.1 today and it's indeed a lot improved now but unfortunately the behavior is not yet fully ideal.

It seems the right sender identity gets not automatically selected when the "To" field contains only an email address but no name. E.g.: "To: <user1@domain.tld>". This doesn't match then and so the proper sender identity gets not preselected when composing a reply even though there is a sender identity with the "user1@domain.tld" address available.

Interestingly when viewing the original message SOGo beautifies the "To" field into "To: me", so here apparently SOGo realizes the To address matches one of the available identities but just upon replying the correct sender identity is not preselected when the To field has only an email address but no name.

But for certain email addresses, e.g. group emails like <support@domain.tld> it is very common that people will put just the email address alone in the "To" field. So it would be awesome if you could still fix this too. Thanks!