Subject: Undelivered Mail Returned to Sender
From: [email-masked] (Mail Delivery System)
To: [email-masked]
Date: Wed, 2 Nov 2022 22:30:33 -0700 (MST)

This is the mail system at host mail.lsmindia.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<[email-masked]>: host mx1a1.comcast.net[96.103.145.165] refused to talk
    to me: 554 resimta-a1p-087373.sys.comcast.net
    resimta-a1p-087373.sys.comcast.net 108.170.60.122 Comcast requires that all
    mail servers must have a PTR record with a valid Reverse DNS entry.
    Currently your mail server does not fill that requirement. For more
    information, refer to:
    http://postmaster.comcast.net/smtp-error-codes.php#554