I found the following:
I use Eudora Pro 3.0, and have never had any problems with majordomo not recognizing my password. Choose "Message > Redirect" (or "Message > Redirect To..." if you have a Nickname set up for your list). You must NOT have the "Turbo ReDirect by Default" checked, under "Tools > Options > Miscellaneous". This creates a new editable message, retaining the original sender in the To: line, and the original Subject: line. Insert a line at the top of the body that reads: Approved: [password]This does not, however, work with Eudora 5.2 (virtually the same as 5.1). It does not retain the original "From" address (and it can't be edited) or subject.