Question undelivered mail returned to sender notifications

[live.support365]

Hello,

I am receiving a lot of emails # undelivered mail returned to sender notifications

How I can stop them.

 

[Kaspar]

Are those bounce messages from actual emails you've send?

 

[live.support365]

I am not 100% sure about that, But I think No.

 

[Kaspar]

There is no SPF record in the DNS of the hostname (srv2.jcwebdevelopments.co.uk) of your server. That leaves your server being vulnerable for abuse. The hostname can easily be used for email spoofing by anyone. Add a strict SPF record asap.