Why do servers not accept email address comments?

by John Smith   Last Updated February 13, 2018 14:00 PM

According to Wikipedia email addresses can contain comments in parentheses (like john.smith(comment)@example.com).

I tried to send out some mails to valid email addresses using such comments using several email servers but all of them complained that the email address does not exist (Unknown address error 550-'Requested action not taken: mailbox unavailable' (delivery attempts: 0)>).

Why is that? Do email servers usually not support commments?

Tags : email address


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