3 ms·how would that work ? don't you need to set up the MX records for that particular subdomain?by funkaster 8y agohow would that work ? don't you need to set up the MX records for that particular subdomain?fredsted 8y agoyou could set up a wildcard CNAMEjlgaddis 8y agoPlease don't. Per RFC, an MX RR cannot point to a CNAME.fredsted 8y agoThat's not what I'm suggesting though.danieldk 8y agoYou set up wildcard MX records, such as for *.yourdomain.tld. With Fastmail sets this up automatically if you let them handle your DNS, though you can (obviously) disable it.