| File Extension: | LETTER |
| File Type Description: | Undeliverable Mail File |
| File Type Developer: | Proofpoint, Inc. |
| Primary Associated Software: | Sendmail |
| Primary Software Developer: | Proofpoint, Inc. |
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Sendmail is the primary software program that utilizes the Undeliverable Mail File file, originally developed by Proofpoint, Inc.. Commonly, Undeliverable Mail File files are found on user computers from United States, and on PCs running the Windows 10 operating system. A high percentage of these users browse the web using Google Chrome.
 | Sendmail by Proofpoint, Inc. |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .MC | Sendmail, Inc. | Data Files | Sendmail M4 Configuration |
| .CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File |
| .ML8 | KIDASA Software, Inc. | Data Files | Milestones Professional 2004 Schedule |
| .SAD | LucasArts Entertainment Company, LLC | Game Files | Lucas Arts Sound Data |
| .TMA | DCI | Data Files | DCI TradeManager Catalog Archive |
| .DLI | Interscape | Data Files | Win32.Sober.AD@mm File |
| .S8 | SIMUL8 | Data Files | SIMUL8 Simulation Data |
| .REQU | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .HY1 | Corel | Data Files | Ventura Publisher Hyphenation Algorithm File |
| .QCK | Esoteric Technologies | Data Files | Jigsaw 2 Astrological Tool File |
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