Outlook-2003 message undeliverable

Hallo,

When I want to send in Outlook Standard 2003(SP3) an encrypted mail, I got almost immediately back the message in my Inbox “undeliverable”.
See log file.

I just installed PGP4Win v2.0.1 and GpgOL 1.0.1. A previous gpg4win-1.1.4. was working fine.

Can someone help me?

Thanks,
JanV