hey team, I too have this error, and although theres a lot of backslapping over the issue being fixed by changing passwords, I dont see how that can be. I can email other TPG emails without issue from OUTLOOK 2010/Windows 10, and yet everyone else returns that error Server error: '550 5.7.1 < >... Relaying denied. IP name possibly forged and i can comfortably send email from the TPG Webmail/postoffice - no issues   surely this must be an issue with the mail server?   please advise ... View more