Robert Pluim <rpluim@gmail.com> writes:
> No, we don't. I'll see if I can come up with some verbiage over the
> weekend, once I reconfigure my brain to (re-)understand autoconf

Apologies for the delay. Autoconf and I don't get on.

The attached patch against emacs-26 results in the following outputs
at the end of the ./configure run. I'm not sure we should suggest
'--without-pop' when that's the new default, but it's probably best to
be explicit.


---begin---
No mailutils installed, ./configure:

configure: WARNING: This configuration installs a 'movemail' program
    that does not support POP3 mail retrieval at all due to lack of
    support for secure channels.
    You might want to install GNU Mailutils
    <http://mailutils.org>
    You can use './configure  --with-pop',
    but this is not recommended.

No mailutils installed, ./configure --with-pop:

configure: WARNING: This configuration installs a 'movemail' program
    that retrieves POP3 email via only insecure channels.
    To omit insecure POP3, you can use './configure --without-pop'.

With mailutils installed, ./configure --without-mailutils:

configure: WARNING: This configuration installs a 'movemail' program
    that does not support POP3 mail retrieval at all due to lack of
    support for secure channels.
    You can use './configure --without-mailutils --with-pop',
    but this is not recommended.

With mailutils installed, ./configure --without-mailutils --with-pop:

configure: WARNING: This configuration installs a 'movemail' program
    that retrieves POP3 email via only insecure channels.
    To omit insecure POP3, you can use './configure --without-pop'.

With mailutils installed, ./configure --with-pop:

# no output

With mailutils installed, ./configure

# no output

---end---