I'm moving some DNS records between nameservers, and while the MX preference values on the old nameserver were all multiples of 10 (10, 20, 30, etc), the web interface for the new nameserver only allows multiples of 25 (0, 25, 50, etc). Am I right in assuming that the actual values don't mean anything, only the order?
Originally posted by tiggee
Only the order of the records matter
You not correct here. For MX records the only thing that matters is preference. The lower the code (0 - the lowest), the higher is preference. SMTP server, when trying to send mail, will seek MX record for your domain with the lowest code (i.e. highest priority). Only if it doesn't answer, it will call the next one, then the next, etc. If the priorities of few MX records are the same, it really doesn't matter for SMTP server to which one of them to send the mail.