Can you ask your network administrator what is the SMTP server name in your corporate LAN. I.e. the email client program such as Outlook will use the SMTP server to send mail. This same SMTP server need to be entered in the "SMTP Mail Server" text box in the TLServer -> "Setup Emails". You will also need to define the period which the TLServer will poll the PLC for email flag and then proceed to send the email.