The good news is that your ini file looks overall quite good. The bad news is that sending SMTP mail over the Internet requires port 25. If you can't convince your ISP to allow you to use port 25 you should switch from MercuryE to MercuryC and relay through their SMTP server.
In MercuryS configuration change server port to 25 (and set 587 as alternate if you plan to use that for message submission). Change port forwarding from your Internet firewall/router accordingly, and you should be able to receive incoming mail.
Note that the MX records for the domain points to a different IP address:
Name=ezish.com
Type=MX, Class=1, TTL=86400 (1 Day), RDLENGTH=10
Preference=21, Mail Exchange=mail2.ezish.com
- Name=ezish.com
Type=MX, Class=1, TTL=86400 (1 Day), RDLENGTH=9
Preference=10, Mail Exchange=mail.ezish.com
Additional Records Section:
- Name=mail2.ezish.com
Type=A, Class=1, TTL=86400 (1 Day), RDLENGTH=4
IP Address=174.37.88.145
- Name=mail.ezish.com
Type=A, Class=1, TTL=86400 (1 Day), RDLENGTH=4
IP Address=174.37.88.145
Coordinate this and make sure to have both the domain name and the appropriate host name as entries under local domains in core configuration.
/Rolf