That setting is in the same place it was under XP's OE:
Tools, Accounts, select that mail account, Properties, Servers.
Check the box for "My server requires authentication".

Incidentally, you are using obsolete port settings, so that may also
impair your ability to send. Go to:
http://helpme.att.net/article.php?item=10918
and use the settings shown in the the last paragraph on that page.

--
Gary VanderMolen, MS-MVP (Mail)


"SLC" <SLC@discussions.microsoft.com> wrote in message news:385BBB27-894B-40E8-BF07-85336C561A1A@microsoft.com...
> And I would locate, change that information where? I'm really lost using this
> Vista..miss XP
>
> "Frank Saunders MS-MVP IE,OE/WM" wrote:
>
>> "SLC" <SLC@discussions.microsoft.com> wrote in message
>> news:FFBFF1E5-8D6B-4621-BD44-A2E9E9EA1C78@microsoft.com...
>> >I have a new HP Touch Smart desktop..runs Vista. My ISP is AT&T Yahoo. My
>> > mail program is set up with AT& T pop settings and my email address is
>> > linked
>> > to this account. This mail account works fine.
>> >
>> > I recently attempted to send a link from IE...much to my surprise, windows
>> > Mail opened...downloaded everything that was in my yahoo mail account but
>> > would not allow me to send the link. Error message:
>> >
>> > The message could not be sent. The authentication setting might not be
>> > correct for your outgoing e-mail [SMTP] server. For help solving this
>> > problem, go to Help, search for "Troubleshoot Windows Mail", and read the
>> > "I'm having problems sending e-mail" section. If you need help determining
>> > the proper server settings, please contact your e-mail service provider.
>> >
>> > The rejected e-mail address was 'slcrac@ameritech.net'. Subject 'RockBuilt
>> > Lofts', Account: 'Yahoo Mail', Server: 'smtp.att.yahoo.com', Protocol:
>> > SMTP,
>> > Server Response: '530 authentication required - for help go to
>> > http://help.yahoo.com/help/us/sbc/dsl/mail/pop/pop-11.html', Port: 25,
>> > Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC78
>> >
>> > I've done all I can to correct this...just can't do it. What am I missing?
>> >
>> > Of note also..I downloaded Windows Mail live at some point during my
>> > frustration because it refered to being able to link all email
>> > accounts...well, that didn't happen so I probably messed that up as well.
>> >
>> > nothing like a new computer to make you want the old one back!!
>>
>> Sounds like you haven't checked the box "My server requires authentication".
>>
>> --
>> Frank Saunders MS-MVP IE,OE/WM
>> Do not reply with email
>>
>>