| 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 |
|---|---|---|---|
| .CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File |
| .MC | Sendmail, Inc. | Data Files | Sendmail M4 Configuration |
| .AQ | Incline Software | Data Files | Ancestral Quest Genealogy Data |
| .XFT | Cay Horstmann | Font Files | ChiWriter Printer Font |
| .ENX | IBM | Data Files | IBM Rational XDE Data |
| .S01 | Lithops Software | Compressed Files | ZipSplitter Part 2 Archive |
| .IAS | SoftWinter | Database Files | BitDefender Data File |
| .15 | IBM | Data Files | IBM Voice Type Languages Scripts Data File |
| .T02 | H&R Block | Data Files | TaxCut 2002 File |
| .VTL | Paul Rädle | Data Files | Vocabulary Trainer File |
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