MyDNS is a free DNS server for UNIX. It was implemented from scratch and is designed to serve records directly from an SQL database (currently either MySQL or PostgreSQL).

Monitoring Solution

Sendmail is the default mail server installed in linux. It acts as both an MTA (Mail Transport Agent) as well as an MDA (Mail Delivery Agent).

What happens when you send an email ?

• Your email client - which is the Mail User Agent (MUA) passes message to its conmfigured MTA, usually a central mail gateway.
• The MTA routes message to the destination, forwarding to other intermediate MTAs as is necessary.
• Domain or destination MTA passes the message to the Mail Delivery Agent (MDA).
• Finally user recieves the message.

Coming back to sendmail - In Redhat based linux distributions, you have to make sure that there are 3 rpm packages installed for successful implementation of sendmail. They are :

1. sendmail
2. sendmail-cf and
3. sendmail-doc

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