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12.2 Available functions

The whole of mu4e consists of hundreds of elisp functions. However, the majority of those are for internal use only; you can recognize them easily, because they all start with mu4e~. These function make all kinds of assumptions, and they are subject to change, and should therefore not be used. The same is true for variables that start with mu4e~; don’t touch them. Let me repeat that:

Do not use mu4e~... functions or variables!

In addition, you should use functions in the right context; functions that start with mu4e-view- are only applicable to the message view, while functions starting with mu4e-headers- are only applicable to the headers view. Functions without such prefixes are applicable everywhere.