xxx@gmail.com is not real.



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Format

If the format is incorrect it will be reported why. For example: unsupported characters, missing @-sign.

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Domain

Any problems looking up the domain (the part after the @-sign) in DNS (Domain Name System) will be reported.

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SMTP

If possible an SMTP connection will be made to a mail server that is responsible for the e-mail, and any issues are reported.