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I've just run into this bug, except for the fact that none
of hte clients who got it are using Eudora, and it is
happening inconsistently.  I believe some of the clients are
using IMP Webmail, and at least one is using pine.  The urls
in the email have two extra '3D's after the '=', and they
also have an extra '=' in the middle of the key.  I'm using
roundup 0.6.4, essentially uncustomized.  Any ideas?