Hi @karmen,   Welcome to the community!   We did an article that you may find helpful, this will guide you on how to perform basic troubleshooting with this issue. Cannot Send Email Rejected by the Server/Banned from using SMTP   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