Thanks for the info, Will. However, the second link you supplied contained this:
More likely problem (as we have seen this many times in the past, though I have no direct information about the IntraStore mail server) is that the server does not implement SASL CRAM-MD5 correctly. Eudora does not know how to do SASL SKEY.
I would suggest you tell Eudora NOT to try CRAM-MD5:
And see if that gets around the problem. If it does, it would be good to contact your ISP and let them know they have a problem with CRAM-MD5.
So, I'll throw this back at ya' - this says it's a server problem.
For lack of anything else, I've blindly put the above line in my eudora.ini file to see if it helps.
Strange, my Eudora help file doesn't have anything about it and the only file in my Eudora directory that contains it is in a new version info file.