Comment to Mailer Problem Resolved
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That happened to me once. You can actually download and install the SMTP Mailer module in your system without any problem. Just do not enable it in the settings if you are not going to use it. If you do enable it, then you will need to subscribe to an SMTP mailing service and provide the SMTP username, password, IP address, port, etc. Otherwise, your UNA will not be able to send emails.
If you disable it, even though it is installed, your system will send emails just fine. UNA uses your server's mail function to send emails.