What is .LETTER file extension?
.LETTER file extension is a known file type. This section of easyfileopener.com tells you everything you need to know about this extension.
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.
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.
You can see a list of software programs here on easyfileopener.com that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.