New comment by PaperMountainStudio on mblaze repository

https://github.com/leahneukirchen/mblaze/issues/186#issuecomment-723319826

Comment:
> as far as I understand this issue is about extending the to keyword to not only match the to header, but also the cc header.

I will try to phrase my issues more clearly next time. I do not think the "to" keyword should match "To" and "CC" headers, that would be confusing.

I think `"cc" ~= ...` is enough. I didn't know about it, but now, reading the manpage I noticed this line:
```
<hdrprop>  ::= from | to | subject | <str>
```
previously I didn't pay much attention to `<str>` when I saw `From`, `To` and `Subject` there. I guess there is a deeper reason why these headers are separate from any other header on this line, but it's a bit confusing.