This is a local issue  on your network, if you have a mail server setup. SMTP is not handled directly by Elog and neither is any other mail protocal. Elog just sends the requested email to your server for processing to the recipients afaict. And whatever server (or service) you use to handle email sending needs to be able to accept them from your mail server. So after verifying which ones  you want to use; (like OutLook, or gmail, or whatever), then have your local email server set up to work with them. You can prol have a 3rd party do this was well (instead of your own local one) but then they would STILL need to be able to work with whatever guidlines the actual sender (gmail, hotmail..) requires to have mail sent. Email is a lonnng trail of different providers, servers, and other actors..

Halvy