Message bouncing back

Message bouncing back

I am getting message bouncing back when sending message through salesinbox

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:

email@emai****.com
    host outbound.mailspamprotection.com [61.15.20.222]
    SMTP error from remote mail server after end of data:
    550 Maximum line length exceeded (see RFC 5322 2.1.1).

Looking forward to your answers.
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