We recommend to perform the troubleshooting steps provided by @david64   Let us know how it will go.   Hi @MarkJV . What email client are you using on your PC? You need to enable authentication on the SMTP (sending) connection. https://community.tpg.com.au/t5/Broadband-Internet/How-to-enable-SMTP-Authentication/m-p/91825 can receive emails on my PC but cannot send them.  Error message says that "530 authenication required". What is this and how do I fix it? MarkJV ... View more