The sending of unsolicited commercial email has become an art form for many spam senders. Carefully wording emails to bypass the Bayesian scanning and make emails look more like genuine emails. Because of this we have introduced some new methods of Spam prevention.
The changes should not affect you apart from seeing a reduction in Spam mail received. However in a small number of cases one of the changes may cause problems for some users trying to send mail. If you receive any time-out errors when trying to send mail make sure that your email client connection timeout period is set to at least 60 seconds.
March 13th, 2006 at 11:43 am
Further to the implementation of these changes some further adjustments have been made to improve the smtp sending experience of our customers. This is detailed in the article below
http://portal.aguk.net/articles/mail-sending-improvements/