fix: v0.5.5 - SMTP auf EmailMessage + async SMTP-Client umgestellt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.5.5] - 2026-02-17
+### Changed
+- SMTP-Versand auf EmailMessage + aiosmtplib.SMTP (async context manager) umgestellt
+- Plaintext-Fallback fuer nicht-HTML-faehige E-Mail-Clients
+- SMTP-Host zurueck auf ssl0.ovh.net
+
 ## [0.5.4] - 2026-02-16
 ### Added
 - Admin: Benutzer direkt anlegen mit Passwort und Rollenwahl

config.yaml

@@ -1,4 +1,4 @@
-version: "0.5.4"
+version: "0.5.5"
 
 bot:
   name: "MeshDD-Bot"

meshbot/auth.py

@@ -96,26 +96,29 @@ async def _send_email(db, recipient: str, subject: str, html_body: str):
 
     try:
         import aiosmtplib
-        from email.mime.text import MIMEText
-        from email.mime.multipart import MIMEMultipart
+        from email.message import EmailMessage
 
-        msg = MIMEMultipart("alternative")
+        msg = EmailMessage()
         msg["Subject"] = subject
         msg["From"] = config.env("SMTP_FROM", "MeshDD-Bot <noreply@example.com>")
         msg["To"] = recipient
-        msg.attach(MIMEText(html_body, "html"))
 
+        msg.set_content("Bitte HTML-fähigen E-Mail-Client verwenden.")
+        msg.add_alternative(html_body, subtype="html")
         smtp_port = int(config.env("SMTP_PORT", "465"))
-        use_tls = smtp_port == 465
-        await aiosmtplib.send(
-            msg,
+        smtp_client = aiosmtplib.SMTP(
             hostname=smtp_host,
             port=smtp_port,
-            username=config.env("SMTP_USER"),
-            password=config.env("SMTP_PASSWORD"),
-            use_tls=use_tls,
-            start_tls=not use_tls,
+            use_tls=True,
         )
+
+        async with smtp_client:
+            await smtp_client.login(
+                config.env("SMTP_USER"),
+                config.env("SMTP_PASSWORD"),
+            )
+            await smtp_client.send_message(msg)
+
         await db.log_email(recipient, subject, "sent")
         logger.info("Email sent to %s: %s", recipient, subject)
     except Exception as e: