The MX Record should be on the root of your domain unless your e-mail addresses look like: user@smtp.mydomain.com
if your e-mail addresses look like user@mydomain.com then the MX must be on the root of mydomain.com.
The MX Record must just point to an A/AAAA/CNAME Record which points to the iRedMail server.
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Re: MX Records
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