Yep. What I ended up doing was going into Authen::SASL::Perl and removing the call to _secflags. It's a horrible hack, but it appears to work - I can now send two messages to myself from the same script. I suppose I should report this to the maintainer of Authen::SASL::Perl.

++ for your help though.

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milkbone - perl/tk instant messaging - it's the only way to fly

You know anyone who'll debug two million lines of code for what I get this job?
- Dennis Nedry