A strip from The Hotspur
See The Hotspur issues 112 - 118; 121. (Note no stories in issues 119 or 120).
Writer:- The Hotspur editorial team. Artist:- Possibly Jim Bleach?
Main cast:- Dan Cameron.
Time period:- 1960's.
There are other ways of delivering mail than by hand. They can be flown in as Dan Cameron does via his floatplane in modern day Canada.
The following adventures of Dan Cameron are from issues 118 & 121.