Get a secure mail key
A security upgrade is coming to AT&T Mail. If you use Outlook for email, you’ll have to update your email settings. Learn more about the security upgrade. bellsouth email settings for outlook

Be sure to create a secure mail key to set up or update AT&T Mail in Outlook 2016.
Set up Outlook 2016 for AT&T Mail
Set up your email for the first time or set it up on a new computer.
Open Outlook, select File, then Add Account.
Choose Manual setup or additional server types.
Select POP or IMAP.
Fill in your user details.
Enter your name as you want it to display to others.
Enter your full AT&T mail address.
Enter the server information.
Account Type - Select IMAP or POP3.
Incoming mail server - Enter imap.mail.att.net (IMAP) or inbound.att.net (POP3).
Outgoing mail server - Enter smtp.mail.att.net (IMAP) or outbound.att.net (POP3).
Fill out the logon information:
User Name - Enter your full email address.
Password - Enter or paste your secure mail key.
Check Remember password and Require logon using Secure Password Authentication.
Select More Settings.
Complete Outgoing Server info.
Check My outgoing server (SMTP) requires authentication.
Select Use same settings as my incoming mail server.
Complete Advanced info.
Incoming server - Enter 993 (IMAP) or 995 (POP3).
Use the following type of encrypted connection - Choose SSL.
Outgoing server - Enter 465 (IMAP and POP3).
Use the following type of encrypted connection - Choose SSL.
Select OK and then Next. Outlook will test your account info. If everything passes, select Finish.
Verify or update AT&T Mail settings
Already have your email set up, but want to update your email account with your secure mail key? It's a simple process.
Select File, then Account Settings.
Choose your AT&T email account and then select Change. 
Confirm or enter the IMAP or POP settings.
Incoming server: imap.mail.att.net (IMAP) or inbound.att.net (POP3) 
Outgoing mail server: smtp.mail.att.net (IMAP) or outbound.att.net (POP3)
Check or enter your User Name (full AT&T Mail address).
Enter your secure mail key in the password field and select the Remember password checkbox. 
Select Next. Outlook will test your account settings. 
Select Close, then Finish.

Bellsouth.net email settings for Outlook
Setting up a Hotmail account on the Outlook is as simple as possible. It doesn’t require any manual configuring of the incoming and outgoing servers. You just enter your credentials and sink emails.

However, that’s not the same for all third-party email clients. Some of them require a manual approach when configuring POP3 SMPT servers.

Nonetheless, if you have even elementary knowledge about this, the procedure is rather simplistic. Of course, we made sure to explain it below. Here’s how to add Bellsouth.net email in Outlook on Windows 10:

Open the Outlook client.
Click on File > Add account.
Choose Manual configure server settings or additional server types and click Next.
Click Yes on the next window.
Enter your Bellsouth.net email address and name.
Choose IMAP and POP. Click Next.
For the Incoming Mail Server, enter imap.mail.att.net.
For the Outgoing Mail Server, enter smtp.mail.att.net.
Enter your email address and password when prompted.
Choose More settings and check both My outgoing server (SMTP) requires authentication and Use same settings as my incoming mail server boxes.
Open Advanced tab and make sure that the Incoming Server port number for POP3 is 995.
The Outgoing Server port should be 465.
Enable SSL under the Use the following type of encrypted connection section.
Click Finish and that should do it.
You might also be interested in 5+ best antivirus for Yahoo Mail to protect your emails

If the test fails, replace the imap.mail.att.net and  smtp.mail.att.net with the pop.mail.yahoo.com and smtp.mail.yahoo.com, respectively. After that, you can try again.

With that, you should be able to receive and send emails without issues. Outlook should allow you all kinds of configuration options and settings, so make sure to customize it to your liking.

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With that being said, we can conclude this article. In case you have anything to add or take from this instruction manual, make sure to tell us in the comments section below. reference link = bellsouth email not working