It doesn't look like att.blackberry.net is configured to receive mail yet.. who knows when:
$ host -t mx att.blackberry.net
Host att.blackberry.net not found: 3(NXDOMAIN)
As compared to:
$ host -t mx mycingular.blackberry.net
mycingular.blackberry.net mail is handled by 10 mx02.bis.na.blackberry.com.
mycingular.blackberry.net mail is handled by 10 mx03.bis.na.blackberry.com.
mycingular.blackberry.net mail is handled by 10 mx04.bis.na.blackberry.com.
mycingular.blackberry.net mail is handled by 10 mx01.bis.na.blackberry.com.
Was just trying to find out info on this myself. I think it sure sucks to have to keey mycingular around when it's not cingular anymore. Plus att is so much shorter to give out to people for my email addy.
My phone service still says Cingular (not AT&T). It's probably just one of those things that will happen in an orderly fashion at some point when other aspects of the old network are folded in to AT&T.
I spoke with AT&T yesterday and eventually made it to tech support. They were unaware if a migration had taken place. They had me delete the device email address and have a new one assigned. To nobody's surprise, the only option showed up as
Tech support guessed an email would go out to all users once they were ready for a system migration.
AT&T Blackberry 9900 v126.96.36.199 BIS
Just to let you all know, ATT /(formerly Cingular) has announced the migration of domains from to . This migration will be taking effect During October and November 2007. You will recieve a courtesy message when you have been migrated. the @mycingular.b.. address will be active through March 2008. This gives you plenty of time to migrate your senders.