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.LETTER File Extension

File TypeUndeliverable Mail File

2.2 (5 Votes)
CategoryMisc Files

What is a LETTER file?

File named dead.letter that is sometimes created on Unix-based systems when email cannot be sent; may be created because the destination address is wrong or because the recipient refuses to accept the email.

More Information

The dead.letter files can be deleted safely. However, if there are further problems sending mail, then the file may be recreated. Therefore, you may have to investigate further to locate why the mail is not being sent.

NOTE: The dead.letter file can be created by the Unix sendmail program. Also, it is sometimes created when invoking the sendmail program with the PHP mail() function.

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Programs that open LETTER files
Updated 2/13/2012

About LETTER Files

Our goal is to help you understand what a file with a *.letter suffix is and how to open it.

The Undeliverable Mail file type, file format description, and Mac, Windows, and Linux programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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