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2.5 Where should I report bugs and other problems with Emacs?

The correct way to report Emacs bugs is to use the command M-x report-emacs-bug. It sets up a mail buffer with the essential information and the correct e-mail address, Anything sent there also appears in the newsgroup news:gnu.emacs.bug, but please use e-mail instead of news to submit the bug report. This ensures a reliable return address so you can be contacted for further details.

Be sure to read the “Bugs” section of the Emacs manual before reporting a bug! The manual describes in detail how to submit a useful bug report (see Reporting Bugs). (See Emacs manual, if you don't know how to read the manual.)

RMS says:

Sending bug reports to the help-gnu-emacs mailing list (which has the effect of posting on is undesirable because it takes the time of an unnecessarily large group of people, most of whom are just users and have no idea how to fix these problem. The bug-gnu-emacs list reaches a much smaller group of people who are more likely to know what to do and have expressed a wish to receive more messages about Emacs than the others.

RMS says it is sometimes fine to post to

If you have reported a bug and you don't hear about a possible fix, then after a suitable delay (such as a week) it is okay to post on asking if anyone can help you.

If you are unsure whether you have found a bug, consider the following non-exhaustive list, courtesy of RMS:

If Emacs crashes, that is a bug. If Emacs gets compilation errors while building, that is a bug. If Emacs crashes while building, that is a bug. If Lisp code does not do what the documentation says it does, that is a bug.