Hello i am hosted at siteground , cloud server and i have the problem of the title. I made my cloud grey from the A record named mail . But nothing better.
I have 3 MX files if that help. Please see below
MX worldcitytrail.com mx30.mailspamprotection.com
30 Auto DNS only
the same with 20 and the same with 10. 10,20,30 are the priority numbers
MX records are only for receiving mail.
Your mail app may be pointing to a 
Proxied hostname to send. What happens when you try to send a message?
It says mail delivery failed:returning message to sender
i have connected it to gmail so i can manage it from there.
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