Postwarp was the N3F’s 1950s-era letterzine. Its contents were not quite limited to letters from members, mostly debating aspects of the N3F and its operations.
| Title | Editor | Year | Month | Issue Number |
| Postwarp | Arthur Rapp | 1950 | March | 1.6 |
| Postwarp | Bob Johnson | 1950 | October | 10/50 |
| Postwarp | Ray Higgs | 1951 | September | 9/51 |
| Postwarp | Ray Higgs | 1951 | December | 12/51 |
| Postwarp | Ray Higgs | 1952 | July | 7/52 |
| Postwarp | Ray Higgs | 1952 | September | 9/52 |
| Postwarp | Ray Higgs | 1952 | October | 10/52 |
| Postwarp | Ray Higgs | 1953 | July | 7/53 |
| Postwarp | Ray Higgs | 1953 | August | 8/53 |
| Postwarp | John Magnus | 1954 | February | 2/54 |
| Postie | Merrill | 1957 | 1957 | |
| Postie | Rich Brown | 1958 | January | 1/58 |
| Postwarp | Rich Brown | 1958 | July | 7/58 |
| Postwarp | Al Lewis | 1958 | September | 10.1 |
| Postwarp | Al Lewis | 1958 | November | 10.2 |
| Postwarp | Al Lewis | 1959 | January | 10.3 |
| Postwarp | Al Lewis | 1959 | March | 10.4 |
| Postwarp | Al Lewis | 1959 | July | 10.6 |