An Post is teaming up with the Irish Red Cross to accept charge-free donations for the Creeslough Community Support Fund.
It says its 920 post offices across the Country will accept donations from tomorrow for those injured and bereaved.
The Creeslough Post Office was based at the shop where the explosion took place on Friday.
Anna McHugh of An Post says plans are underway to provide an alternative post office for locals in the Creeslough area.
"There was a post office there in Creeslough caught up in the dreadful tragedy and we will be making arrangements to have post offices services made available at an alternative location for the community."