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Telnet SMTP Check to Verify Email address - Avoid Blacklist

This project received 14 bids from talented freelancers with an average bid price of $213 USD.

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Project Budget
$30 - $250 USD
Total Bids
14
Project Description

I use Telnet for verifying the email address.

See screenshot of how I verify the email address using Telnet.

1. http://screenpresso.com/=l7kdb

2. http://screenpresso.com/=Efejb

The problem is that after verifying some thousand email addresses. The IP's gets listed in the blacklists. Once they are in blacklist no further email verification happens.

I have tried to run the verification through multiple IP ranges of around 16 IP's but almost every IP got listed in blacklist after verification of few thousand emails.

I want to get the email verification done in huge numbers without getting in blacklist.

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