Folgendes Ergebnis bekkomme ich bei vollem debugging:
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: Attempting to Connect: Host 62.50.xx.xx, Port 25, SSL Port 0, Connecting Domain unser.server.de
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: Connection successful
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 220 Fremder Server mails
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: CommandEHLO: EHLO unser.server.de
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250-Fremder Server
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250-PIPELINING
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250-SIZE 48000000
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250-VRFY
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250-ETRN
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250-ENHANCEDSTATUSCODES
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250-8BITMIME
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 250 DSN
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: SMTP Authentication is not required by local server. Username: -blank-
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: Attempting to SubmitMessage:
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: Pipelined commands:
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: MAIL FROM:<markus.xxx@mydomain.de> SIZE=5264
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: RCPT TO:<markus.xx@fremdedomain.de>
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: DATA
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: End of pipelined commands
15.12.2011 14:17:13 [0E58:000E-1310] SMTPClient: ReceiveResponse: 503 5.5.1 Error: need RCPT command
Ich hab das mal den Admins der Empfänger-Domain gesandt, mal sehen was die dazu sagen ausser "da wird keine Verbindung aufgebaut"...