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SMTP standards : needs outgoing SMTP server be MX for my domain?

An organization refuses emails from my domain, under this reason :
My domain's mailer that connects to their SMTP server is not MX of my

Indeed it is not, I have different hosts for ingoing and outgoing email
Actually, I see no good reason why outgoing mailer should be the same as MX.

I am wondering if SMTP standards require that email sender of a domain be
its MX? I find that really surprising.

I'll be glad to know if anyone can enlight me.



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