AT&T outsourced their customer email services to Yahoo after Ameritech had outsourced their email to prodigy(many years ago and why you see the mx records pointing to prodigy.net).  Yahoo was purchased by what is now Verizon Media.  There is an active project ongoing to move email off to AT&T.  But it's been a multi-year project.  I know, I work as an IT consultant and here in the Chicago area, there are many of my customers still using ameritech.net email accounts.  Bellsouth.net is in the same shape.  Moved to Yahoo and now being moved to AT&T owned services.

When customers are moved off of Yahoo to AT&T, suddenly their Outlook doesn't work.  AT&T is using OAuth and if you have an old version of Outlook(2016 is considered old and doesn't support OAuth), you have to get a secure mail key to use instead of your normal password to access your email via Outlook.


Lyle

On 12/4/20 4:54 PM, Scott Mutter via mailop wrote:
Who is hosting mail for bellsouth.net <http://bellsouth.net> ?

bellsouth.net <http://bellsouth.net>.          10571 IN      MX      10 ff-ip4-mx-vip2.prodigy.net <http://ff-ip4-mx-vip2.prodigy.net>. bellsouth.net <http://bellsouth.net>.          10571   IN      MX      10 al-ip4-mx-vip2.prodigy.net <http://al-ip4-mx-vip2.prodigy.net>. bellsouth.net <http://bellsouth.net>.          10571   IN      MX      10 al-ip4-mx-vip1.prodigy.net <http://al-ip4-mx-vip1.prodigy.net>. bellsouth.net <http://bellsouth.net>.          10571   IN      MX      10 ff-ip4-mx-vip1.prodigy.net <http://ff-ip4-mx-vip1.prodigy.net>.

Is bellsouth's mail handled by Verizon?  That'd be weird.

Have to assume that bellsouth.net <http://bellsouth.net>'s email is being handled by AT&T, since bellsouth's MX records and AT&T's MX records are the same

att.net <http://att.net>.                14400 IN      MX      5 ff-ip4-mx-vip2.prodigy.net <http://ff-ip4-mx-vip2.prodigy.net>. att.net <http://att.net>.                14400   IN      MX      5 al-ip4-mx-vip1.prodigy.net <http://al-ip4-mx-vip1.prodigy.net>. att.net <http://att.net>.                14400   IN      MX      5 ff-ip4-mx-vip1.prodigy.net <http://ff-ip4-mx-vip1.prodigy.net>. att.net <http://att.net>.                14400   IN      MX      5 al-ip4-mx-vip2.prodigy.net <http://al-ip4-mx-vip2.prodigy.net>.



On Fri, Dec 4, 2020 at 3:53 PM Marcel Becker <marcel.bec...@verizonmedia.com <mailto:marcel.bec...@verizonmedia.com>> wrote:


    On Fri, Dec 4, 2020 at 12:13 PM Scott Mutter via mailop
    <mailop@mailop.org <mailto:mailop@mailop.org>> wrote:

        Anybody from AT&T able to contact me off list concerning an
        issue with messages sent from our server (192.158.238.23) to
        AT&T related email addresses and being delivered into their
        spam folder?


    That highly depends on which domain you are sending to. Most
    consumer domains are not hosted by ATT but by us.

    Also remember that there are other reasons why emails might be
    delivered to an individual's spam folder, which have nothing to do
    with your reputation.

    Cheers,
    Marcel


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