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Problems with Email Delivery to Hotmail/MSN?

There have been increasing number of posts on forums about problems with email delivery to Hotmail/MSN domains in the last few weeks.

As the numbers seemed to be higher than usual, I made some enquiries and received a response which I will summarise here.

Apparently they changed something at the beginning of April, that has caused problems for "small senders" (their words, not mine).

The suggestions are as follows:

  1. Submit a support web form for assistance:
  2. Apply for Smart Network Data Services

There is more information on the email services from Microsoft on their postmaster site at: