If a user is having problems Sending AT&T - receiving is fine, then they should first verify if their email client is configured properly. You can also check if your port 25 is blocked or not. If you are having issues understanding the technicalities of the process, you can access AT&T Mail Toll Free Number team to help you resolve your issues with regard to sending mails. If you are having any issues with this you can contact us at AT&T tech support and we can help you by giving you step by step instructions on this.>>