email validation software

[omoutop]

Hi all...

i seek a good programm to validate emails out of a mailing list (txt format, aroud 3 thousant of them).

Every free/trial programm i tested didnt respond good to my tests (showed wronf emails where i knew they were good ones, or failing to respond to such a "huge" list)

Anyway, do you have any suggestions/proposals?
I dont care if it is free or commersial, but i need it to work flawlessly.

Thanks in advance

[rocknbil]

By "validating" do you mean validate syntax or actually validate the email address as a real address?

I just finished a project that did this in the millions - compare two lists and identify addresses present in both lists, but it validated syntax as well. We can discuss via PM/sticky if this is what you're looking for.

[omoutop]

I can validate syntax as well as valid domain of the email (with php) (and of course i can clean 2 or more lists of identical emails)
What i look is a way to determine if an email actually exists (possible a way to check the MX records)

I know not how to do this, so i turn to a ready made programm/script.

[lawman]

Duplicate found HERE [webmasterworld.com].