Solve an error "535 5.7.0 authentication failed"

This guide resolves an email error of type "535 5.7.0 authentication failed".

Solve an error Authentication failed

The e-mail authentication service on the servers can encounter a problem for a few brief seconds in an exceptional way, during unusual events on the infrastructure e.g.

If an error 535 5.7.0 authentication failed occurs:

• Try sending the email message again and it should go.

If the problem persists, check the points of this other guide.