On Wed, Oct 24, 2018 at 04:28:29PM +0530, Burn Zero wrote: > Currently my mail setup is using TLSv1 to connect to O365. Now that O365 > has announced dropping their support for TLSv1, TLSv1.1, how to enable > support for TLSv1.2 in postfix 2.8.2? > > My openssl version is OpenSSL 1.0.1e-fips 11 Feb 2013
Support for TLS 1.2 was added in OpenSSL 1.0.2. Postfix 2.8 supports TLS 1.2 just fine, provided the OpenSSL it is linked with does the same. You need a less ancient operating system whose OpenSSL library is at least 1.0.2. Note that OpenSSL 1.0.1 reached end of life last year, is no longer supported, and likely has some residual security warts. -- Viktor.