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- Mar 19, 2020
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You should upgrade to V16 as soon as possible. V15 is EOL now.
Also note, that if you try to send a Welcome email to a mailbox that was not yet created, or does not exist, our SMTP will block you for while. The only solution is to use your own server but that requires a Pro License and above.
For now, you can go in the SMTP settings and press the test button to see if you receive a test email at least. If that fails too, then check that your public facing IP is correctly showing in the dashboard. If the IP is misconfigured, the check will also fail.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.