troubleshooting Question

MX record failover and duplicate entries

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fireguy1125 asked on
ExchangeDNSEmail Protocols
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We have 4 MX records for our domain. 2 are ours, and 2 are pointing to a backup MX service.

My question is regarding specifically our 2 MX records.  This seems unnecessary, and I dont know what the purpose is of having both of these, since we only have 1 e-mail server.

Our entries are:

company.org.        600    IN    MX    5 company.org.
company.org.        600    IN    MX    20 mail.company.org.
company.org.        600    IN    MX    30 globala.backupmx.com.
company.org.        600    IN    MX    40 globalb.backupmx.com.

when I attempt to telnet to mail.company.org 25, i don't get a connection.  When i telnet to company.org 25, I get successful connection.

Does that mean that the mail.company.org MX record is invalid and unnecessary?

Can I remove the mail.company.org MX record?

Also, regarding the failover aspect of the MX records.  If the company.org and mail.company.org are not accessible, such as when telnet port 25, does that mean it will attempt to go to next priority, which would be our backup mx service?

Thank you!
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