OPS335 Email Lab Troubleshooting
Contents
Set up two email servers to exchange email
The proper way to do it is through DNS with the proper domain delegation (root name server, top-level domain name servers, etc). However, we can try the short-cut to get this working for just two domains to exchange their emails:
For example, we have two domain lucas.org and salituro.org with the following configuration:
Email server for 1st domain: vm2 - 192.168.30.3 (FQDN for vm2 - vm2.lucas.org) DNS domain name for the 1st domain: lucas.org
Email server for the 2nd domain: VM3 - 192.168.30.4 (FQDN for vm3 - vm3.salituro.org)
DNS domain name for the 2nd domain: salituro.org
To run a DNS server to provide resource records for both domains
Need to have two zone files defined for the DNS server.
zone for lucas.org
file name: db-lucas.org $TTL 1D lucas.org SOA .... lucas.org IN NS vm1.lucas.org. vm1 IN 192.168.30.2 vm2 IN 192.168.30.3 lucas.org IN MX 10 vm2.lucas.org. ...
zone for salituro.org
file name: db-salituro.org $TTL 1D salituro.org SOA vm1.lucas.org. root.lucas.org ( ... ) salituro.org IN NS vm1.lucas.org. salituro.org IN MX 10 vm3.salituro.org. vm3.salituro.org. IN A 192.168.30.4 ...
Update named.conf
original zone: lucas.org
zone "lucas.org" {
type master;
file "db-lucas.org";
};
add the 2nd zone: salituro.org
zone "salituro.org" {
type master;
file "db-salituro.org";
};
Testing
Run nslookup and query the same DNS server for the MX records for the lucas.org and salituro.org domains.
