Am 02.02.2012 16:22, schrieb Dennis Putnam:
> But your link appears to be for mail clients. I'm not using a mail 
> client other than sendmail. 

this does not interest the server on the other side
for him you are a client like each other

> The from addresses already match AT&T mailbox names. 

and you are trying to use a yahoo server

if you send authenticated mails using yahoo servers
as relay you are supposed to use yahoo-addresses
or have to setup you own server

>>>>> http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html
>>>>> (in reply to MAIL FROM command))

> Perhaps I am missing what the MAIL FROM is really supposed to be

yahoo i guess if you are using a yahoo server

if you are using our server for sending relay messages it will also
only accept senders with domains we own and at least the whole
address must exist

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