I had deleted the MX records earlier because of the mail routing problem. If I have MX records for filtered and unfiltered, it randomly sends the email through which I thought was related to the priority.
You might want to use the Mail Test tool at http://www.DNSreport.com to see exactly what mailservers will do.
"Randomly" will be done if there are multiple MX records with the same priority. Otherwise, they will be used in order. So if you have an MX record with a priority of 10 and another with a priority of 20, the 10 will always be used first (by an RFC-compliant mailserver -- spamware may not follow the rules!).
If you have 2 10s and a 20, the 2 10s will be used randomly (both will be tried before the 20).
-Scott
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