The classic answer would be "Use Net::SMTP" or a similar module instead of cooking up your own.

In this case I hesitate to recommend that module though since last time I checked it was still in need of some improvements to really make it useful (mostly in returning useful error codes to the caller)

As for your code, there's plenty of things you should change:

• - Uncomment the use strict
• - You don't handle multiline replies from the server (a lot of servers have a welcome message that's more than one line)
• - You're not checking any return codes from the server
• - MAIL FROM: and RCPT TO: are supposed to be uppercase

There's probably a few more things but those would be a good start.

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