Surprised no one has suggested Mars relay yet.
Do the mass.
Without breaking out the slide rule,
An Atlas 541 sent the Curiosity Rover plus MSL (3893kg) to Mars.
Leasat (According to Gunther) was 3400kg at launch, 1388kg after GSO insertion.
The DV to go from Mars Transfer to Mars orbit is less than the DV to go from GTO to GSO.
So assuming this spacecraft is very similar to Leasat and Leasat needed a DV of 1800 m/s to go from GTO to GSO.
Then assuming the propulsion system is suitable for a trip to Mars and Mars insertion, the only real issue is paying for the Atlas v541.
It's not free, someone has to pay for the rocket, mods to the spacecraft to do the relay mission, and solar panels need to generate enough power at Mars orbit to power the spacecraft and mission (This may be the real show stopper).