From: David Rogoff on
On 2010-03-29 21:39:15 -0700, David Rogoff said:

> On 2010-03-29 21:01:17 -0700, isw said:
>
>> In article <4bb1706e$0$19292$c36e2926(a)unlimited.newshosting.com>,
>> David Rogoff <david(a)therogoffs.com> wrote:
>>
>>> Help! I've got two new Macs - a Mini I use and my wife's Macbook.
>>> Everything was working fine for a couple of months and then, suddenly,
>>> we can't send mail from her Macbook. It says that the ID was rejected
>>> by the smtp server (smtp.west.cox.net). I don't know what's going on.
>>> It still works fine, with the same settings, on my Mac. I tried my
>>> account on her Mac and that didn't work either. When I ran the
>>> connection doctor it all passed.
>>>
>>> What's going on?
>>
>> Your ISP has likely changed the port number for SMTP. Contact them to
>> find out what they did. You may now need a password to send mail when
>> you didn't previously.
>>
>
> Thanks for the reply, but that's not it. I guess I wasn't clear: if I
> use the exact same setting on my Mac, it works fine.


I fixed the problem by reverting to an earlier version of
com.apple.mail.plist. When I have some time, I'll try and diff the
old and broken versions of the files to see what got messed up. All
the smtp settings looked identical in mail's preferences.