This error is typically seen due to a setting in the CSF firewall or another firewall. It might be caused by having the following set:
You would need to change SMTP_ALLOWLOCAL to 1 to enable webmail to function.
If that does not end up being the issue, try disabling the firewall to see the results. If it works, I would then suggest going to CSF forum to ask about what might be the cause.
SMTP_BLOCK = 1
SMTP_ALLOWLOCAL = 0
SMTP_ALLOWLOCAL = 0
If that does not end up being the issue, try disabling the firewall to see the results. If it works, I would then suggest going to CSF forum to ask about what might be the cause.
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