It’ll cost more to send mail starting Sunday.

The first rate increase since 2002 will boost the cost of sending a first-class letter by 2 cents, to 39 cents.

The increase follows legislation requiring the Postal Service to place $3.1 billion in an escrow account this year. Another rate boost is likely next year to cover rising costs for the agency.

Many rates, such as parcel post and advertising mail, vary by distance or whether the material is presorted.