Hi @antgresh, Our SMTP Server automatically blocks and Postmaster can manually block email address from sending email using SMPT for security purposes. Most common issue is when an email address is been compromised and being use for the following. TPG SMTP servers detected that the email address is sending spam emails, virus or malware. TPG SMTP server has detected that your account is sending message to a large number of recipients; Unsolicited bulk email (UBE) / Unsolicited commercial email (UCE). TPG SMTP Server has detected that your email has been used with a foreign IP Address “overseas”. You can follow the simple steps below to fix this issue: Change you TPG account password online: https://www.tpg.com.au/home/myaccount After changing the password. Wait for 15-30 minutes before sending an email.   Let us know if we can be of further assistance.   Regards, Karl ... View more

Hi @antgresh,   We did an article that you may find helpful, see this link, Changing NBN Plans through My Account.   Should you need further assistance, feel free to search community for help or chat with us at https://www.tpg.com.au/support/contact/  and we'd be glad to assist you.   Regards, ... View more