List of supported ciphers by our SMTP servers

Your server can connect to ImprovMX 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
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