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I have client website hosted on my server but they use a different mail server not hosted with us, so we basically have

1.MX entry to their mail server IP with priority 10
2.DNS A record to their mail server 
3.DNS MX record with  with priority as 0

My problem comes when i try to install the SSL certificate it only sends to the

What i wanted to do is bypass their mail server for this email address only using DNS settings or MX priority number ..

is this possible or never ?

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up vote 0 down vote accepted

Not possible, MX records are only looked up for the domain -- the user part is not used nor available to the DNS server.

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