Christine, have you checked in your spam/junk folder for the email - perhaps contact your ISP and just make sure that they are not blocking the address
contact@... at all - it also helps if you add this address to your address book,? If you still don't find it, perhaps try and re-subscribe
could be that your mail bounced a few times in a row, then the system assumes you no longer want the post and automatically unsubscribes you - this is a automated system and is called a hard bounce.
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Warm Creative Hugs
Daleen