Which Email Validation Services are the best?

[Jessica_Kao3]

I'm a big fan of strikeiron/Informatica.  High quality data, easy integration with Marketo, it's a simple web hook, the codes are super detailed so you can write campaigns to auto segment and put folks on an exclusion list.  And it's really affordable. 

I did a bake off between Informatica and some other vendors and they showed the lowest false positives and negatives. 

[SanfordWhiteman]

Kind of surprised they don't validate in real-time on their own forms, though!  (I think you guys have different expectations of "real-time.")

[Julie_Hansberry]

Does anyone have experience with using email ping services, to check the validity of a group or email addresses before including them in a campaign?  I did a little recon and it looks like this company provides a free email ping service to shopify, amazon, nespresso and others.  https://moonmail.io/email-verification-email-list-cleaning/ .. Does anyone have an alternative recommendation?