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4.2.5 Encryption Settings

Option: ssl yes-or-no

Enable or disable the TLS/SSL encryption between the MUA and the MTA. The default is ‘no’, but using the TLS/SSL encryption is recommended. You should also set your private key and certificate using the ‘ssl-key’ and ‘ssl-cert’ keywords (defined below).

See section Using the TLS/SSL Encryption, for details.

Option: ssl-oneway yes-or-no

Enable the ONEWAY encryption. Set ssl-oneway yes, if you want to use the TLS/SSL, but your MUA doesn’t support ESMTP TLS/SSL. Using this option does not require setting the ‘ssl-key’ and ‘ssl-cert’ options.

Option: ssl-priorities list

Sets cipher suite preferences to use. The list argument is either a single initial keyword or a colon-separated list of TLS keywords. The description of TLS keywords is well beyond the scope of this document. Please refer to Priority Strings in GnuTLS Manual, for a detailed discussion.

The default priority list is ‘NORMAL’.

Option: ssl-cert file-name

Specify the certificate for the TLS/SSL encryption.

Default for file-name is ‘anubis.pem’.

Option: ssl-key file-name

Set the private key for the TLS/SSL encryption.

The default file-name is ‘anubis.pem’.

Option: ssl-cafile file-name

Specify CA certificate file (supported only by GnuTLS).

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