Ranjith Ariyaratne, the postmaster general, has urged postal workers to halt their strike and come to work.
The mail service is only now open three days a week due to the gasoline shortage.
As a result, only Tuesdays, Wednesdays, and Thursdays will see the opening of all post offices and sub-post offices.
Many post offices are still open for many days even though they were only supposed to be open for three.
