vpopmail[37658]: vchkpw-smtp: vpopmail user not found karen@:95.*.*.*

After upgrading certain shared servers to FreeBSD 10x i came to the follwing conclusion:

chmod ug+s /usr/local/vpopmail/bin/vchkpw

The servers needed that after i manually selected SMTP AUTH in the make config of the port:
/usr/ports/mail/qmail

Or the qmail user couldnt execute it right and created MASS CHAOS in the building where i worked at that moment. Ppl couldnt auth right with authenticated SMTP, vpopmail.

Gr gr: Thomas