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Thank you for your very prompt response. I will certainly find out. Is it possible that if port 25 is blocked that about 50% of the addresses in my list don't have this problem while the remaining ones do? Thank you.

I have exported a .vcf file with 128 records from my Mac Contacts and ran eMail Extractor on it. I then took the resulting 136 valid addresses (some records have more than one address) and ran them in eMail Verifier. It was set for 100% bandwidth, 10 threads, 10 retries and timeout at 15 using...