MX18 Send via SMTP – Set up smtp.mx18.com with TLS (port 587), use your API token as password, verify sender. Also includes Telnet testing and error codes. MX18 is a powerful full-suite Email API platform designed to meet the communication needs of developers, enterprises, and service providers. With its integrated delivery intelligence system, MX18 ensures reliable, fast, and secure... https://docs.mx18.com/mail-send/send-using-smtp/