Trouble trying to send email from emacs

When I try to send email from emacs I get the error message:

503 5.7.0 encryption too weak 0 less than 39

Anyone know how to do this?  I am able to send email using Entourage or the
OS X Mail program, so maybe I should try to send mail from emacs via one of
those programs?

Sending email used to work fine for me but my sttp server (at Princeton) is
now requiring authorization that appears to use that encryption.

 Gil



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