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Thanks to you both for your reply, I understand it a bit better now.
The reason I asked was, I had just changed my email address as my old one was getting too much 'spam' so sent my new one to my friend and asked for one to be sent to me for testing purposes.
It is certainly possible to send one E-mail to different people on different E-mail servers (say Gmail to Yahoo or to MSN) and have them arrive at widely different times, and not on a consistent basis.
Whereof one cannot speak, thereof one should be silent.