What are you validating?
Al throws in his own two cents on the question of real time address validation.
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Can you verify email addresses in real time?
In a recent discussion about spamtraps and address lists and data collection a participant commented, “[E]very site should be utilizing a real-time email address hygiene and correction service on the front end.” He went on to explain that real time hygiene prevents undeliverable addresses and spamtraps and all sorts of list problems. I was skeptical to say the least.
Yes, there are APIs that can be queried at some of the larger ISPs to identify if an account name is taken, but this doesn’t mean that there is an associated email address. Yes, senders can do a real time SMTP transaction, but ISPs are quick to block SMTP transactions that quit before DATA.
I decided to check out one service to see how accurate it was. I’m somewhat lucky in that I created a username at Yahoo Groups over a dozen years ago but never activated the associated email address. This means that the account is shown as taken and no one else can register that address at Yahoo. But the address doesn’t accept any mail.