Net::SMTP talks whatever server you tell it to. In 99% of the time, that is the local MTA that relays it to the destination server. Finding the destination server requires looking up the MX records and acting like an MTA.

For this problem of finding which email addresses are valid, that may be a good solution.

In reply to Re: Re:x2 Net::SMTP success / failure response by iburrell
in thread Net::SMTP success / failure response by Anonymous Monk

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