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I had the same question and what I found is that the methods being used by email verification software have maybe 50% accuracy and those email scrubbing companies are way too pricey and not much more accurate. This forced me outside the box and I came up with my own process which cuts about 85-90% of the bad addresses. If you have a way of exporting them to me in some kind of CSV format and importing them back into your system afterwards, I can most likely help. If you want, message me and let me know what kind of flexibility you have with imports/exports of the data, how big of a DB we're talking about and if there aren't any big roadblocks for me I can probably help you out.Another good practice which I've since implemented (and took me about 5 hours of hair-pulling research to finally uncover) is to setup a filter on your mail server and filter all the bouncebacks to a special "bounced" folder. Then what you can do is use a program to extract the addresses from all the failed messages into a list and run it against your database to remove the bad ones. Once every couple months, go through and remove all the bad addresses, which will at least keep the disease from spreading any more. =P HERE is a great tutorial on how to do it. They reference their email scrubbing software for the part of the process where you compare the bad addresses to your database, but you can easily dig around on Google for a cost-free piece of software that does the same thing and substitute it for this step.
I had the same question and what I found is that the methods being used by email verification software have maybe 50% accuracy and those email scrubbing companies are way too pricey and not much more accurate.
This forced me outside the box and I came up with my own process which cuts about 85-90% of the bad addresses. If you have a way of exporting them to me in some kind of CSV format and importing them back into your system afterwards, I can most likely help. If you want, message me and let me know what kind of flexibility you have with imports/exports of the data, how big of a DB we're talking about and if there aren't any big roadblocks for me I can probably help you out.
Another good practice which I've since implemented (and took me about 5 hours of hair-pulling research to finally uncover) is to setup a filter on your mail server and filter all the bouncebacks to a special "bounced" folder. Then what you can do is use a program to extract the addresses from all the failed messages into a list and run it against your database to remove the bad ones. Once every couple months, go through and remove all the bad addresses, which will at least keep the disease from spreading any more. =P HERE is a great tutorial on how to do it. They reference their email scrubbing software for the part of the process where you compare the bad addresses to your database, but you can easily dig around on Google for a cost-free piece of software that does the same thing and substitute it for this step.
