Validating the email


16-Jul-2020 15:51

For people suggesting using mail Mail Message(), that thing is WAY to flexible.Sure, C# will accept the email, but then exchange server will bomb with 5.1.3 runtime error as soon as you try to send the email. NET library which can validate email addresses following all of the current IETF standards (RFC 1123, RFC 2821, RFC 2822, RFC 3696, RFC 4291, RFC 5321 and RFC 5322), tests the related DNS records, checks if the target mailboxes can accept messages and can even tell if a given address is disposable or not.Also read Mark Swanson, "How not to validate email, ", mdswanson.com/blog/2013/10/14/…const string pattern = @"^((([a-z]|\d|[! \^_`~]|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF]) (\.([a-z]|\d|[! \^_`~]|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF]) )*)|((\x22)((((\x20|\x09)*(\x0d\x0a))? (([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])|(\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF]))))*(((\x20|\x09)*(\x0d\x0a))? (\x22)))@((([a-z]|\d|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])|(([a-z]|\d|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])*([a-z]|\d|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])))\.) (([a-z]|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])|(([a-z]|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])*([a-z]|[\u00A0-\u D7FF\u F900-\u FDCF\u FDF0-\u FFEF])))\.?$"; Email address validation is not as easy as it might seem. quit the message if you made it this far, everything is good.there is many other important validations not just the string, it is better to check if the email is exists at this smtp server or the user is entering any email..

validating the email-70

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Phil's answer is also going to work only with PCRE standard... - Everything before the @ is simplified, so that at least javascript will work.What's wrong with bobby table's email address if you're using prepared statements.We're talking about valid email addresses, not other things that have nothing to do with what constitues a valid email address, like how to properly do SQL queries so that you don't get SQL injection problems.For that, the only real way is to send a message to confirm.

Note that e-mail addresses are more forgiving than you might first assume.It has a lot more detail and some other ideas of how to solve the problem.



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