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Hi Nick
The same occurred to me once.
Im my particular case that delay happends due a looooong line on the server. It tooks something about 36 hours!! to get delivered.
But, just in case what is your email preference? PHP mail(), sendmail, smtp or authsmpt?
Try to change it if you?re often having problems.
Also, did you try to ask your hosting about any problem that could be occurred at the time?
Regards,
Wilson