Protect your email by adding DKIM, SPF and dmarc records to protect your email accounts from spoofing and spam. These records help prevent email spoofing by setting a policy for mail sent from unauthorized mail servers. This should help prevent spoofing and bounce-backs going forward.

IF Not… here is what you could get and 100s of these a minute 🙁

From: Mail Delivery System Mailer-Daemon@XYZ.abc.com
Subject: Mail delivery failed: returning message to sender
Message body:
This message was created automatically by mail delivery software.
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:
XYZ@gmail.com
host smtp.XYZ.com [###.###.###.25]
SMTP error from remote mail server after end of data:
550 Message contained spam content (antispamcloud.spam.genjnk157)
crazyeye1388@gmail.com
host smtp.XYZ.com [ip address]
SMTP error from remote mail server after end of data:
550 Message contained spam content (antispamcloud.spam.genjnk157)