Download as .EML / Show source not working

[nichtmax]

Describe the bug
Download as .EML or show source results in an error: Access denied / Disallowed Sec-Fetch Dest: document Mode: navigate Site: cross-site User: false

To Reproduce
Steps to reproduce the behavior:

1. Go to a specific mail
2. Click on Download as .EML / Show source
3. See error

Expected behavior
Download as .EML starts / source is shown

Screenshots

Please complete the following information:

• Browser: Safari / Version 18.1.1 (20619.2.8.11.12)
• IMAP daemon: dovecot
• PHP version: 8.1
• SnappyMail Version: 2.38.2
• Mode: standalone

Additional context
We're pretty sure this is a new behavior which is introduced with the update from 2.38.1

[the-djmaze]

My main concern is that Safari thinks it is "cross-site".
Did you test with other browsers?

[nichtmax]

You're right, this seems to be a Safari only problem. It's working in Firefox and Chrome.