Validating a email
Building your email list by accepting as such email addresses, your list will be filled up with inaccurate and undeliverable email addresses.
If you send emails to such email address, the ratio of bounce back emails will be much higher.
Below is a detailed description of how entire email validation process works: Most of the online websites have web forms asking for customer details along with email address.
During this form fill up, intentionally or by error, users may enter a wrong email address.
However, in the real world ESPs accept addresses that are not RFC-valid, and reject addresses that are.
When we built our validator, we did based on real-world data RFC spec to ensure more accurate validation.
Email list verification is a process of determining whether a list of email addresses is valid and deliverable.
Note that the regular expression is compiled using the System. This pattern can be repeated one or more times, and must be followed by the top-level domain name.
[0-9a-z]*.) [a-z0-9][-a-z0-9][a-z0-9]))$` is interpreted as shown in the following table. If the character that follows @ is not an opening bracket, match one alphanumeric character with a value of A-Z, a-z, or 0-9, followed by zero or more occurrences of a word character or a hyphen, followed by zero or one alphanumeric character with a value of A-Z, a-z, or 0-9, followed by a period. To determine whether an email address is valid, pass the email address to the System.
So, if you are planning to run bulk email campaigns like sending newsletters, identification and removal of invalid email addresses is essential.
Here’s a fairly common code sample from Rails Applications with some sort of authentication system: If you’re experienced at Regex, this seems simple. Sections 3.2.4 and 3.4.1 of the RFC go into the requirements on how an email address needs to be formatted and, well, there’s not much you can’t do in your email address when quotes or backslashes are involved. From Milliseconds(200)) Catch e As Regex Match Timeout Exception Return False End Try If invalid Then Return False ' Return true if str In is in valid e-mail format.