[ GET ] Free bulk emails list verifier tool

For the hosts which reroute all emails and therefore accept all addresses as valid. I would start with a randomCryptic Email-Adress like hdpbe315jfkel_rogb5331@host if the host return valid address you can be nearly 100% sure that this host will accept all addresses.
For the IP maybe you could try to use tor / rotating proxy. There are a few docker images (ready to run) that will rotate every few minutes. But I am not sure if the large mail Hoster did not already block them for request on port 25.


- "Accept all" is another problem to solve and can be figured out easily

- About using tor or rotating proxy, this would never work as you must have rDNS associated with your IP
 
Your‘re right i forgot the reverse dns thing. Then mate I guess that a free mass-check tool with mx validation will need a good algorithm for work distribution and a wide distributed network of servers. I remember a webpage where you could get information whether your own email was compromised by any leak or hack. Could be a good start to use such sites to validate only a few.
On the other hand storing the data would be useful to avoid a second request with the same address.
Pretty impressed by your generosity :-)
 
Your‘re right i forgot the reverse dns thing. Then mate I guess that a free mass-check tool with mx validation will need a good algorithm for work distribution and a wide distributed network of servers. I remember a webpage where you could get information whether your own email was compromised by any leak or hack. Could be a good start to use such sites to validate only a few.
On the other hand storing the data would be useful to avoid a second request with the same address.
Pretty impressed by your generosity :)


Yup, I am going to have a caching layer for sure, The focus right now is to get the accuracy near to 95%. Thanks for your awesome feedback :)
 
Since you are already thinking of all possible issues during realisation I would add a feature wish :-)
Maybe you could calculate a score of the given email instead of valid or invalid. @gmail > @trashmail, marcel > fksbgbl, ....
So the ppl with bulk request could build up segments with all email > 90% valid or > 50%. Bounce rate should increase on second scenario for sure...
 
Verification scripts don't work for millions, it may work for a few hundreds and on a slow pace. The best way is you get your email server configured with somewhat flexibility to control your sending and later use some intelligent email marketing software for filtering out the data based on your sendig.
 
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