Hi David,
* David Bremner <david@tethera.net> [2021-09-06; 10:00]:
> Gregor Zattler <telegraph@gmx.net> writes:
>> I therefore tried to change `mail-user-agent' via the customization
>> interface (clicking the radio button "Other:" and providing
>> "notmuch-user-agent" as value) but then I got an error
>> message:
>>
>> custom-variable-mark-to-save: Saving mail-user-agent: Invalid function: notmuch-user-agent
>>
>
> This seems like a bug in the defcustom for mail-user-agent (i.e. a bug
> in emacs).
> I think you will find that
>
>    (setq mail-user-agent 'notmuch-user-agent)

thanks, I will use this.

> works. My reading of the documentation (and either my reading or the
> docs could be wrong) is that the symbol for a mail-user-agent need not
> be a function.  Quoting the docstring for define-mail-user-agent
>
>     SYMBOL can be any Lisp symbol.  Its function definition and/or
>     value as a variable do not matter for this usage; we use only certain
>     properties on its property list, to encode the rest of the arguments.
>
> Other user agents, e.g. 'gnus-user-agent, 'message-user-agent, and
> 'sendmail-user-agent do not seem to have function definition. On the
> other hand, it is a bit surprising that no-one noticed a problem with
> "Other" mail-user-agent values before now.

Actually this is a bit above my lisp knowledge.  Do you
think your explanation suffices for a bug report against emacs?

Ciao; Gregor
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