correspondence file
nounUK /ˌkɒrɪˈspɒndəns faɪl/
US /ˌkɔːrəˈspɑːndəns faɪl/
A folder where letters and messages are kept together.
She put all the letters from her pen pal into a correspondence file.
OTHER MEANINGS
2. A collection of written communications kept for an official record.
The office keeps a correspondence file for every client.
3. A computer document that stores emails or letters.
He saved the emails in a correspondence file on his laptop.
4. A set of letters exchanged between two people.
Their correspondence file shows years of friendly letters.