Re: [PATCH RFC3.5 03/12] send-email: Interpret --smtp-server "" as "use a default".

Michael Witten [off-list ref] writes:

Why not? It's at least useful for testing.

Why so?  "Use a default" as opposed to using what?

It is unclear what "a default" is in this context.  Do configured values
count as "a default"?  I suspect not.

I think you meant "allow overriding the configured values and use the
default", but then you should spell what the defaults are (an available
local MTA binary, or SMTP port on localhost, I think).  That is much more
informative than your "Why not?..."

In any case, I find it counterintuitive to trigger "use the default" with
an option.  Something like "--ignore-config=smtp-server,smtp-port" might
make sense, though.