Jun 14, 2019
Error 550 5.1.1 Recipient address rejected: User unknown is being shown..
It is confirm that email id is ok..
Informational notification.
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All Replies (3)
550 5.1.1 means that the recipient email server considers that the email address doesn't exist at the destination domain, and therefore has no way to deliver it. Unless you made an error typing out in the email address, this is not something for you to correct and needs to be corrected on the receiving end. Please refer to this - https://tools.ietf.org/html/rfc3463, where it reads X.1.1 Bad destination mailbox address The mailbox specified in the address does not exist. For Internet mail names, this means the address portion to the left of the "@" sign is invalid. This code is only useful for permanent failures.
Feb 18, 2020
Just to make sure, I am contacting you - can I do something to be visible for them? Or is it their fault?
-- Gsuite issues are best handled by either contacting the domain admin, any support option the domain is entitled to, or by posting in the specialized Gsuite Admin Help Community here - https://support.google.com/a/community?hl=en.
So, please create a thread on that community by clicking on this link: https://support.google.com/a/thread/new?hl=en and post about this to receive the best possible guidance from the experts.