Special characters sometimes not displayed correctly in email

[DonkeeeyKong]

Describe the bug I recently changed the email provider. I have a script that runs as a custom hook that outputs some special characters (ä,, ö, ü), that were not displayed correctly in the mail after that. I believe the previous email provider made sure the email was reformatted to be displayed correctly which the current doesn't. The script sends the mail as text/html without specifying a charset which makes it use ISO-8859-1. If a mail is sent in debian without specifying a header it automatically uses plain/text and the charset of the system (in my case utf-8) – which formats the characters correctly. Imho, it would be better to use utf-8 for the script's email as well.

To Reproduce Send email that contains special characters. See if it's displayed correctly. Can be tried via: echo "üüüüü" | mailx -a 'Content-Type: text/html' -s "Test-Mail" root vs the correctly encoded: echo "üüüüü" | mailx -a 'Content-Type: text/html; charset=UTF-8' -s "Test-Mail" root

Expected behavior Email should be displayed correctly regardless of email provider or email program.

Please complete the following information:

• Distro: openmediavault 7 / Debian 12
• AIO Sceipt Version 3.3.2
• Have you tested the latest stable version? Yes

[DonkeeeyKong]

This should be fixed by #123. My emails were always displayed correctly after this change.

[auanasgheps]

Merged the PR and closing this issue. Thanks for reporting and the PR!