Emails are getting kicked back

What does the error message say when they are kicked back?

has email  I blocked out numbers

plus host al-ip4-mx-vip2.prodigy.net[########]
    said: 553 5.3.0 alph755 DNSBL:RBL 521< 162.###.11.230 >_is_blocked.For
    assistance forward this error to abuse_rbl@abuse-att.net (in reply to MAIL
    FROM command)

Your sending mail server has been placed on AT&T's internal block list.  Assuming you are the owner of the sending mail server, send an e-mail, including the message you received to the address indicated (abuse_rbl @ abuse-att.net).  Make sure that the e-mail looks like it was written by a human, not a spam bot; discuss your history with the IP address (e.g. you just got it, etc.) and aver your commitment to not send unsolicited bulk e-mail from this address going forward.

Not sure why they would add a government agency on a black list

It's not always obvious who owns the IPv4 on a mail server, especially when it hosted by a cloud/hosting company.