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Large Email List: I have a large email list which is very outdated, I need help with cleaning the lsit by doing an MX lookup and check if the mailbox exists.

Posted on 2010-08-31
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Last Modified: 2013-12-18
Hi,

I have a large email list which I'm looking to clean up to ensure that 100% of emails follow a proper format, check MX record to ensure the domain exists and also check if the mailbox exists.

I've spent countless hours looking everywhere for a way to achieve this and haven't been able to find a solutions. I would really appreciate help in this. Thank you in advance.

Best,

Tom
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Question by:faithless1
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illhelpu earned 500 total points
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by:faithless1
ID: 33573485
Thanks this solves the MX lookup issue. Is there any way to actually check if a mailbox exists? I want to make sure there are no bounced emails coming back
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by:ITaaS
ID: 33578144
There is no way to verify a mailbox exists without attempting to send a message unless you have access to the email server.  I am assuming this list is emails gathered from outside parties, so there is really no way for you to verify prior to sending.
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by:fredmc
ID: 33578211
Can you use a Perl script, and do you the ability to install Perl modules on the server? If so, I can give you a script.
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by:illhelpu
ID: 33578262
I don't believe there is a way to verify if a mailbox exist if you do not have access to the server.
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by:jar3817
ID: 33585612
There exists a verb in SMTP called VRFY that allows you to do just that, verify an address is valid. The problem is what you want to do is exactly what spammers do. As a result the VRFY verb has been disabled by default (and should be) on almost every modern email system.

The only way to weed out the bad addresses is to send your email to the whole list and then watch your logs for the non-delivery reports. Then remove those addresses from your list.

Consistently emailing bad recipients is a red flag and might get you blacklisted.
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