[Open Source Forums] Mail delivery failed: returning message to sender

[Mail Delivery System]

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A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  7205514772 at txt.att.net
    host mx3b.txt.att.net [166.216.152.132]
    SMTP error from remote mail server after RCPT TO:<7205514772 at txt.att.net>:
    550 5.1.1 <7205514772 at txt.att.net> recipient does not exist here.
  5202723687 at txt.att.net
    host mx3b.txt.att.net [166.216.152.132]
    SMTP error from remote mail server after RCPT TO:<5202723687 at txt.att.net>:
    550 5.1.1 <5202723687 at txt.att.net> recipient does not exist here.
  6822705971 at txt.att.net
    host mx3b.txt.att.net [166.216.152.132]
    SMTP error from remote mail server after RCPT TO:<6822705971 at txt.att.net>:
    550 5.1.1 <6822705971 at txt.att.net> recipient does not exist here.
  5624810584 at txt.att.net
    host mx3b.txt.att.net [166.216.152.132]
    SMTP error from remote mail server after RCPT TO:<5624810584 at txt.att.net>:
    550 5.1.1 <5624810584 at txt.att.net> recipient does not exist here.
  7736070606 at txt.att.net
    host mx3b.txt.att.net [166.216.152.132]
    SMTP error from remote mail server after RCPT TO:<7736070606 at txt.att.net>:
    550 5.1.1 <7736070606 at txt.att.net> recipient does not exist here.
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Date: Mon, 29 Oct 2018 05:46:53 -0700
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