Description of problem:

I am but a weary email admin travelling from the ancient land of CentOS6, our homeland is withering and we come to this new land of CentOS8 seeking shelter. In our old homeland we seeked the help of SPF to protect our villagers from the plagues of the internet but alas it was marked "experimental" and was not available to the masses. As we arrive in CentOS8 land we find EXIM is now available and we are happy, but again alas we find no help from SPF though it is now "Stable". Can not we add SPF to the baseline release so we might provide better protection from the plagues and dragons of the internet for our citizens ?

https://github.com/Exim/exim/wiki/SPF
As of version 4.91, SPF support has been promoted from Experimental to Supported status.


Version-Release number of selected component (if applicable):
Exim version 4.92.3

How reproducible:
100%

Steps to Reproduce:

Try to enable SPF in exim.conf

deny message = $sender_host_address is not allowed to send mail from $sender_address_domain 
  spf = fail

Actual results:

Exim errors out because SPF is not in release.

Expected results:

SPF works.

Additional info: