- Move test email form to a standalone card at the top of the page
(was buried at the bottom of SMTP settings)
- Add 'An mich' button that fills in the logged-in user's email
- Send HTML + plain text test email (multi-alternative) styled like
actual Stiftung emails, instead of plain text only
- Include diagnostic info (SMTP server, sender, user) in test email
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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