I'm not sure but I think error 452 is telling you that you have too many recipients. In order to cut down on spam, a lot of servers are using progs such as NETDOOR which limits the amount of e-mail you can send or receive at one time (usually about 25) from one sender. If this is the case you can try to break your messages down to groups of 25 or less, or get a mailing list program that can do this for you.
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