Email address validation services - how do they commercialize an uncertain service?
Email address validation services - how do they commercialize an uncertain service? This is the question from Stackoverflow but i did not get the desire ...
We have recently published an hosted email validation service based on our EmailVerify.NET, an award-winning and well known email validation component for the .NET platform; while I can't answer for every other service you mentioned, I can certainly do it for ours:
- EmailVerify.NET does not employ the VRFY command at all, as it may lead to potential bans from external mail exchangers;
- blacklisting is always possible and Netiquette must always be respected while performing the validation job (although there are no written rules here): our component allows to bind itself to any available IP address and to cycle the originating IP addresses during the validation process, thus increasing the number of validations that can be performed at once while lowering at the same time the possibility of a ban.
My experience also shows that most email validation services out there do not offer the quality one would expect for even syntax validation (there are at least 7 different RFCs to follow, a simple regular expression is not the right choice here); before choosing one, I suggest you to ask for a demo with your own sample data (EmailVerify.NET has an online demo page you can play with, if you wish). Most, for example, do not support quoted words or non-ASCII domains or mailboxes, which are becoming quite common nowadays, or do not filter out disposable (temporary) email addresses.
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