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Yes, IMSS supports RSA 2048-bit. In fact, IMSS provides a sample certificate file that is tsmtpd.pem in <IMSS_HOME>/config. This file uses RSA 2048-bit.

The following third-party modules also support RSA 2048-bit:

  • Postfix 2.3.8
  • Tomcat 5.5.x
  • Apache 2.0.x and 2.2.x