SMTP outbound mail relay

Does it support inbound POP/IMAP?  If so why wouldn't you expect it to support SMTP?  I am assuming that no matter how you access att/yahoo email (business and otherwise) the servers are the same, i.e., what's documented here.  I don't know if there are separate servers defined for business accounts or not.  Try the ones I referenced and if they don't work call tech support (800-288-2020, or is there another support number for business accounts?).

So, after more than four calls to AT&T Customer Service about this issue, I finally have a useful answer.

First, AT&T does have an outbound SMTP mail relay and it's at the FQDN given in the page you provided. It's smtp.mail.att.net and supports both 587 and the obsolete 465.

However, what I finally learned today, by posing leading questions to the Customer Service staff, was that Fixed Wireless Business service does NOT include E-mail service. Therefore, I can't use smtp.mail.att.net.

However, what I finally learned today, by posing leading questions to the Customer Service staff, was that Fixed Wireless Business service does NOT include E-mail service.

I sort of implied I didn't know anything about business accounts but them not supporting any email access is a bit surprising.  Just as well though. IMO, now you can go out and look for a real email service (i.e.,one that knows how to run an email service), with privacy, support, and decent spam fighting tools.  All things att/yahoo email doesn't have (again IMO).  I wouldn't recommend anyone running a business use yahoo as their primary email service provider.