unknown Destination

I have been on hold with AT&T support with NO Help for 38 min as of this writing.

We have had the same issues all day today for just one of our five emails.  was on phone for an hour with a live tech onshore as they called it (USA) and the best she could say was lookup email client instructions.  I did find that if you can sign in under the web browser and see your emails then it is something wrong with your email client.  I can access on my iphone and the web browser but no other device....What happened

Totally agree that ATT has made some changes but why just to one email and on certain devices

I believe there were issues with email mapping today to Win mail client and Kindle clients.  The one email was a main account email that had additional user emails. The oddity is user emails worked fine though we noticed lag on outbound sending.  The main email account would constantly fail on set up with Unknown Destination msgs. Finally close to 930 pm cst I was able to rebuild the Win client and the struggled with Kindle build. I wasted 3+ hrs waiting on hold and trying everything I could.  Att and Yahoo were useless and all they had to do was admit there were mapping server issues. Shame on both of them

Same issue here, email works on every device except both of our Kindle Fire tablets. I have tried everything I know. Good to see it is not just us.  Probably time to get rid of AT&T account if they have no solutions or help for us!

Finally worked on each device and got them all to work late this evening.    If you google on att email client and look for email setup it brings up a chart that categorizes how to set up each different device.  laptops and PC need a security key rather than the actual password, the apple items use just the password but it shows you steps to accomplish it.  The security key needs to be set up under the ATT email sign on.  The security key is very long. 

On the laptops and PC I updated the office software as I had outlook and then inserted the security key for the password key then it worked.  

All of this took hours to accomplish between yesterday and today

Southernhome THANK YOU!!  Although it still took me an hour to get through all the ATT obscure information, links, etc. your information led me to the right place to finally set up a successful sign in to email on our two Kindles.  To summarize the way I understand it ....ATT apparently, without notification to us,  discontinued allowing us to use our password to sign in to our email on any device that uses an email app that does not encrypt our sign in info. We must now create a secure mail key and use it on any of these specific devices. The web site link I used   https://www.att.com/support/article/email-support/KM1240308    Create A Secure Mail Key    This link has step by step directions.  I was able to set up a secure mail key that now serves as our password for email on devices that do not work with our regular email password. 

Southernhome and CLWM sending you both a huge THANK YOU!!!!  My laptop needs the key and my phone the password!  What a pain!!!  AT&T should be ashamed of themselves!!  NO notification??!!