Postfix already has a configuration page for SPF [0], albeit requiring a package from universe. So although removing the SPF snippet from Exim could be an option in the short-term, I do think in the long-term Ubuntu's SPF support for Exim should be somewhat equivalent to that of Postfix's.
Adding a fragile snippet to a docs would come with the same caveats as including a fragile snippet in the stock Exim config, just with less culpability.
Ultimately using Exim's native SPF facility, i.e. that of libspf2, is the right approach in my mind.
Postfix already has a configuration page for SPF [0], albeit requiring a package from universe. So although removing the SPF snippet from Exim could be an option in the short-term, I do think in the long-term Ubuntu's SPF support for Exim should be somewhat equivalent to that of Postfix's.
Adding a fragile snippet to a docs would come with the same caveats as including a fragile snippet in the stock Exim config, just with less culpability.
Ultimately using Exim's native SPF facility, i.e. that of libspf2, is the right approach in my mind.
[0] - https:/ /help.ubuntu. com/community/ Postfix/ SPF