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I got this error, please advice.
There was a problem while sending the test email.
Error due to unsolicited and/or bulk e-mail.
This means the connection to your SMTP host was made successfully, but the host rejected the email.
Typically this error is returned when you are sending too many e-mails or e-mails that have been identified as spam.
Recommended next steps:
Check the emails that are sending are sending individually. Example: email is not sending to 30 recipients. You can install any WordPress e-mail logging plugin to do that.
Contact your SMTP host to ask about sending/rate limits.
Verify with them your SMTP account is in good standing and your account has not been flagged.