We are aware of customers getting bounce backs from hotmail.co.uk and Live.co.uk domains due to Microsoft blacklisted the IP address of one of our shared servers(swift11).
We are in the process of getting this de-listed and hopefully this shall be resolved asap.
UPDATE – While we wait for Microsoft to delist our IP we have put in place a workaround by sending mail out through an alternative IP.
Swift Internet NOC 
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