AT&T SMS domain mobile.att.net no longer valid In MailSite 7 and later the SMS/email gateway listed for AT&T is mobile.att.net. This domain no longer works and has been replaced by mmode.com

You should update the domain under the Wireless Carriers option in the MailSite Console found under:

MailSite Console > Server > Wireless Carriers

1. Select AT&T
2. Select Edit
3. Change the domain listed under SMS Gateway to mmode.com
4. Select OK and exit the menus

If you have any emails waiting to be delivered to the mobile.att.net domain, then you can add a Forced Route into MailSite. This will send the messages to the correct remote server.

MailSite Console > Server > Routes

1. Enter the Domain Mask as mobile.att.net
2. Select Force
3. Select Add
4. Select Routes
5. Enter 199.88.234.33 under the HOST box*
6. Select Add
7. Select OK and exit the menus
8. Open Schedule Management tab under Schedules in the MailSite console
9. Enter mobile.att.net under the 'attempt immediate delivery' box, then select the button 'reattempt delivery to these domains now!'.
10. MailSite will try redelivering email for the mobile.att.com domain and see that there is a forced route entered. One the emails have been delivered you can delete the route in MailSite if you wish.

NOTE: The IP 199.88.234.33 current the mail server for the mmode.com domain. You should verify the IP is still valid before making the change.