Supported Ciphers by Our SMTP Servers

A list of encryption ciphers supported by our SMTP servers.

Your server can connect to servers by encrypting the connection using TLS or STARTTLS.

In order to be compatible, we support a broad set of ciphers and protocols, which range from SSLv3 to TLSv1.3.

Here's the full list:

• SSLv3

  • ADH-AES256-SHA

  • ADH-CAMELLIA256-SHA

  • ADH-AES128-SHA

  • ADH-CAMELLIA128-SHA

  • SRP-DSS-AES-256-CBC-SHA

  • SRP-RSA-AES-256-CBC-SHA

  • SRP-AES-256-CBC-SHA

  • RSA-PSK-AES256-CBC-SHA

  • DHE-PSK-AES256-CBC-SHA

  • AES256-SHA

  • CAMELLIA256-SHA

  • PSK-AES256-CBC-SHA

  • SRP-DSS-AES-128-CBC-SHA

  • SRP-RSA-AES-128-CBC-SHA

  • SRP-AES-128-CBC-SHA

  • RSA-PSK-AES128-CBC-SHA

  • DHE-PSK-AES128-CBC-SHA

  • AES128-SHA

  • CAMELLIA128-SHA

  • PSK-AES128-CBC-SHA

• TLSv1.0

  • ECDHE-ECDSA-AES256-SHA

  • ECDHE-RSA-AES256-SHA

  • AECDH-AES256-SHA

  • ECDHE-ECDSA-AES128-SHA

  • ECDHE-RSA-AES128-SHA

  • AECDH-AES128-SHA

  • ECDHE-PSK-AES256-CBC-SHA384

  • ECDHE-PSK-AES256-CBC-SHA

  • RSA-PSK-AES256-CBC-SHA384

  • DHE-PSK-AES256-CBC-SHA384

  • ECDHE-PSK-CAMELLIA256-SHA384

  • RSA-PSK-CAMELLIA256-SHA384

  • DHE-PSK-CAMELLIA256-SHA384

  • PSK-AES256-CBC-SHA384

  • PSK-CAMELLIA256-SHA384

  • ECDHE-PSK-AES128-CBC-SHA256

  • ECDHE-PSK-AES128-CBC-SHA

  • RSA-PSK-AES128-CBC-SHA256

  • DHE-PSK-AES128-CBC-SHA256

  • ECDHE-PSK-CAMELLIA128-SHA256

  • RSA-PSK-CAMELLIA128-SHA256

  • DHE-PSK-CAMELLIA128-SHA256

  • PSK-AES128-CBC-SHA256

  • PSK-CAMELLIA128-SHA256

• TLSv1.2

  • ECDHE-ECDSA-AES256-GCM-SHA384

  • ECDHE-RSA-AES256-GCM-SHA384

  • ECDHE-ECDSA-CHACHA20-POLY1305

  • ECDHE-RSA-CHACHA20-POLY1305

  • ECDHE-ECDSA-AES256-CCM8

  • ECDHE-ECDSA-AES256-CCM

  • ECDHE-ECDSA-ARIA256-GCM-SHA384

  • ECDHE-ARIA256-GCM-SHA384

  • ADH-AES256-GCM-SHA384

  • ECDHE-ECDSA-AES128-GCM-SHA256

  • ECDHE-RSA-AES128-GCM-SHA256

  • ECDHE-ECDSA-AES128-CCM8

  • ECDHE-ECDSA-AES128-CCM

  • ECDHE-ECDSA-ARIA128-GCM-SHA256

  • ECDHE-ARIA128-GCM-SHA256

  • ADH-AES128-GCM-SHA256

  • ECDHE-ECDSA-AES256-SHA384

  • ECDHE-RSA-AES256-SHA384

  • ECDHE-ECDSA-CAMELLIA256-SHA384

  • ECDHE-RSA-CAMELLIA256-SHA384

  • ADH-AES256-SHA256

  • ADH-CAMELLIA256-SHA256

  • ECDHE-ECDSA-AES128-SHA256

  • ECDHE-RSA-AES128-SHA256

  • ECDHE-ECDSA-CAMELLIA128-SHA256

  • ECDHE-RSA-CAMELLIA128-SHA256

  • ADH-AES128-SHA256

  • ADH-CAMELLIA128-SHA256

  • RSA-PSK-AES256-GCM-SHA384

  • DHE-PSK-AES256-GCM-SHA384

  • RSA-PSK-CHACHA20-POLY1305

  • DHE-PSK-CHACHA20-POLY1305

  • ECDHE-PSK-CHACHA20-POLY1305

  • DHE-PSK-AES256-CCM8

  • DHE-PSK-AES256-CCM

  • RSA-PSK-ARIA256-GCM-SHA384

  • DHE-PSK-ARIA256-GCM-SHA384

  • AES256-GCM-SHA384

  • AES256-CCM8

  • AES256-CCM

  • ARIA256-GCM-SHA384

  • PSK-AES256-GCM-SHA384

  • PSK-CHACHA20-POLY1305

  • PSK-AES256-CCM8

  • PSK-AES256-CCM

  • PSK-ARIA256-GCM-SHA384

  • RSA-PSK-AES128-GCM-SHA256

  • DHE-PSK-AES128-GCM-SHA256

  • DHE-PSK-AES128-CCM8

  • DHE-PSK-AES128-CCM

  • RSA-PSK-ARIA128-GCM-SHA256

  • DHE-PSK-ARIA128-GCM-SHA256

  • AES128-GCM-SHA256

  • AES128-CCM8

  • AES128-CCM

  • ARIA128-GCM-SHA256

  • PSK-AES128-GCM-SHA256

  • PSK-AES128-CCM8

  • PSK-AES128-CCM

  • PSK-ARIA128-GCM-SHA256

  • AES256-SHA256

  • CAMELLIA256-SHA256

  • AES128-SHA256

  • CAMELLIA128-SHA256

• TLSv1.3

  • TLS_AES_256_GCM_SHA384

  • TLS_CHACHA20_POLY1305_SHA256

  • TLS_AES_128_GCM_SHA256