MX records and SMTP

Hi guys,
I need some explanations on Mx records and the transfer of mail. What i am trying to understand is when mail leaves the client,it then goes to the SMTP server to be sent out. How does the smtp know where to send or relay the mail to.Is there suppose to be an MX record for the destination address? I would like to understand better that entire process. Thanks everyone...
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ikm7176Connect With a Mentor Commented:
you would like to read the link below to get the overview of how e-mail works.

you can ask for more information if required

Exchange_AdminConnect With a Mentor Commented:
mail leaves the client and goes to the SMTP server. The SMTP server does a DNS lookup for the MX record of the damain that the mail is going to. It then forwards the mail to the server returned by the DNS lookup.
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