Thank you Rob,
I am not home right now. I do believe it is a "POP3" . I will double check when I return home this evening. ( When I set up the incoming / outgoing mail it was (eg; ) "pop.cayenne.com" )
Please note, some of the "un-received" e-mail came from sources other than Yahoo! Some were from a company that uses it's own domain name. ( Interestingly, and much to my great frustration, that company sends me e-mail throughout the month. Some I get, some I don't. ) One was from an individual who simply replied to an e-mai I sent, but I never received his reply.
The provider is webmail. ( I had an acquaintance in the business set this up for me. He is the one who told me he did multiple tests, found no problem, etc. Still, I am going nuts because I must be able to rely on this completely to receive e-mail.)
Again, any insight you may have is greatly appreciated.
Thanks,
Eddie