A mail exchange (MX) record directs incoming email sent to your domain to the specific server set up to accept email traffic for your domain. For example, if your email is on eProMail you have MX records that point to mx1.emailsrvr.com (10) and mx2.emailsrvr.com (20).
On your DNS server, set up MX records for both mx1.emailsrvr.com and mx2.emailsrvr.com with the following information:
Hostname: blank or @
Time to live (TTL): 3600
Record type: MX
Destination: mx1.emailsrvr.com
Priority: 10
Hostname: blank or @
Time to live (TTL): 3600
Record type: MX
Destination: mx2.emailsrvr.com
Priority: 20