receiving Authentication Error..outgoing mail not working outlook 2011 for mac (new customer)

Hi, lchar

Please verify your outlook settings again. Here are the steps to verify your email settings and a few more steps which may fix your issue.

In the User Information section:

1. Under Your Name field, type your name the way that you want it to appear to other people.
2. In the E-mail Address field, enter your full AT&T email address e.g., YourName@att.net. If you are setting up this account for an AT&T Email Alias, input the alias email address in this field.

In the Server Information section:

1. In the Account Type field, verify POP3 is displayed.
2. In the Incoming Mail (POP3 or IMAP) Server field, enter inbound.att.net
3. In the Outgoing Mail (SMTP) Server field, enter outbound.att.net

In the Logon Information section:

1. In the User Name field, enter your full email address.
2. In the Password: field, enter your password. If you are setting up this account for an AT&T Email Alias, input the full email address of the ID (Primary or Sub Account) associated with the email alias in this field. Do not input the email alias address in this field.
3. Select the Remember password check box.

1. Select More Settings.
2. Select the Outgoing Server tab.
3. Verify these settings:

1. The check box beside My outgoing server (SMTP) requires authentication is selected.
2. The radio button beside Use same settings as my incoming mail server is selected.

1. Select the Advanced tab.
2. Verify these settings:
   1. The Incoming mail (POP3) should be port 995 and the check box next to This server requires a secure connection (SSL) is selected.
   2. The Outgoing mail (SMTP) should be port 465 and the check box next to This server requires a secure connection (SSL) is selected.

1. Click OK.
2. Click Next.
3. Click Finish.

Now close Outlook and go to the link : http://att.my.yahoo.com, hover the mouse on More, select Member Center.

If you are already logged in to your email it will ask you to re-login, otherwise you will be asked to enter your log in information Twice. You will land on the Account Information Page of your ATT/Yahoo email.

Minimize the browser, open Outlook and try sending a test email to yourself.

If it is not working, Delete the account from Outlook and configure it again.

I hope this will help!