Sending via mail...
Opening STARTTLS connection to `mail.rub.de:587'...done
STARTTLS negotiation failed: 
250 8BITMIME

STARTTLS

220 ready for tls

*** Starting TLS handshake
- Ephemeral Diffie-Hellman parameters
 - Using prime: 1032 bits
 - Secret key: 1013 bits
 - Peer's public key: 1024 bits
- Certificate type: X.509
 - Got a certificate list of 4 certificates.

 - Certificate[0] info:
 # The hostname in the certificate does NOT match 'mail.rub.de'.

smtpmail-send-command: Process SMTP not running