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@bbrian017
If you check the headers of a received email (open the message in Outlook Express, select 'file/properties' then the 'details' tab) there should be a 'return-path' header (not to be confused with 'reply-to'). Some mail transport systems require the return path to match the 'from' header.
Or, it may just be that your ISP subscribes to a Block List service like Spamhaus which can slow things down while mail is checked. If the emails have upset your host's own mail server spam filter, there should be an indication of that in the headers too.
One reason I would like to see the Pligg devs address the root vulnerability of this type of spam attack is that sending (potentially) hundreds of registration emails in one go sounds like a sure fire way to get yourself into trouble with your ISP.
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