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The parsed addresses are a list of addresses that are syntactically valid (and optionally pass DNS and ESP specific grammar checks).

The unparsable list is a list of character sequences that could not be parsed (or optionally failed DNS or ESP specific grammar checks).

An email address identifies an email box to which email messages are delivered.

A wide variety of formats were used in early email systems, but only a single format is used today, following the standards developed for Internet mail systems since the 1980s.

Different email validation rates are given based on the API endpoint.

Both the public and private API endpoints are limited to a burst per minute rate.

Validating email address using regular expressions is tricky and is often not recommended. A valid email address as defined by RFC 2822 can be quite complex.

A valid email is of the format: [email protected] The name can be a set of ‘atoms’ separated by dots. single or double quotes and any character inside the quotes Now, to the domain part. MUSEUM .travel, .international or even .vermögensberatung For example all the following email addresses are valid: Source The sad truth is that despite the complex regular expression validation, the email may not be existing, so can still be invalid for practical purposes.With the introduction of internationalized domain names, efforts are progressing to permit non-ASCII characters in email addresses.The transmission of electronic mail within the Internet uses the Simple Mail Transfer Protocol (SMTP), defined in Internet standards RFC 5321 and RFC 5322, and extensions like RFC 6531.Smith as equivalent to John Smith or even as johnsmith, and mail systems often limit their users' choice of name to a subset of the technically valid characters.In some cases they also limit which addresses it is possible to send mail to.The whole purpose of the Javascript email validation should be to check for any unintentional error (like entering name instead of email).