ESRS GATEWAY: Migration to SMTPs

Good morning,
I have the ESRS GATEWAY version 3.38.05.16. I need to migrate my system from SMTP server to SMTPs  (Email alerts) server with the following prerequisites:

• Secure connection type: TLS / STARTTLS
• Authentication type: AUTH LOGIN
• Ciphers suite supportate: (Protocol TLSv1.2) - TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA

Is there a way to set up SMTPs? Because as a guide I have not found anything. 
Thanks!