SMTP mail relay server - authenticated SMTP service, mobile / relaying denied and SMTP errors solved.      Home       Products       Pricing       Support       Contact       Sign Up       Log In    AuthSMTP - The Ultimate, Global SMTP Mail Service. Do you have problems with outgoing email Do you want the ultimate SMTP service Your ISP provides no SMTP server Unreliable or overloaded SMTP servers - causing email delivery delays ' Relaying Denied ' errors Limited to sending small email attachments You are not allowed to send using your own domain name Email getting blacklisted, caught as spam or rejected by other mail servers No usage controls or manageability Virus scanning of mail sent. Massive file attachments allowed - up to 50Mb 'data' per message. Reliable, super-fast SMTP mail delivery . Usage controls and detailed logging. Ability to automatically duplicate outgo