I'm trying to add external hosting for my emails

[Mut-Clement]

I bought a domain via Shopify and now I'm trying to add external email hosting.

My host said it was possible using the following DNS settings;

mail.vertifarm.com. 1800 CNAME vertifarm.com

smtp.vertifarm.com. 1800 CNAME vertifarm.com

imap.vertifarm.com. 1800 CNAME vertifarm.com

vertifarm.com. 3600 MX Priority: 10 Destination: mx1.rdsa-mail.com

vertifarm.com. 3600 MX Priority: 20 Destination: mx2.rdsa-mail.com

vertifarm.com. 3600 MX Priority: 30 Destination: mx3.rdsa-mail.com

I have added the DNS settings in my Shopify as below but I can't receive emails, I'm not sure what I'm doing wrong.

When I send a test email Gmail gives me the below error.

Kind regards