Thank you all, I found the log at: /var/log/mail.log I think that it is decipherable enough for me to believe that the ones that don't make it have been sent to my ISP SMPT host. I suppose that I could ask my ISP to check their log for the disposition of one of the message IDs in question, I don't know if they'll go to the bother. Still not enough information to know for sure, but I'm starting to think that it's that list and not me. Peace, Dave
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