This also occurs with exim4-daemon-heavy and my Nokia E70 with EPOC mail. Since the problem is in GNUTLS, it can be worked around by using OpenSSL, which is fortunately simply a case of editing debian/rules such that OPENSSL := 1.
UNfortunately, this isn't so staightforward with -heavy because apparently linking it with OpenSSL constitutes a GPL violation. You are thus forced to build an exim4-daemon-custom (and violate the GPL) in order to get -heavy's features with OpenSSL. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]