Email configuration

Hi All,

I have a virtual server through webmin configured for a domain name registered elsewhere.

I have only been using it for a web site at the minute, so have just changed the relevant A records in the DNS settings.

I now want to look at using email through webmin for this domain.

So, I have enabled mail for the domain, and created a user email.

1/ Should I just need to change a few more A records and the MX record as suggested in the virtualmin suggested dns settings?

2/ Should I ever need to change the nameservers??

3/ Do I need to do anything with reverse dns??

Many thanks in advance,