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> i really dont know if this setup (MX record but no A record) is
> RFC-OK. The only think i know is that it's been working for years and i
> receive thousand of emails daily on my several subdomains with no
> problem at all.
The EMAIL RFC requirement is that a domain name has an MX record
or an A record (see RFC 5321 Section 5). There is no EMAIL RFC
requirement to have an MX record AND an A record.