Author: Adrian I. Lam
Revision Date: 2021-06-05 11:43:55 UTC

Remove sender/return-path/author check.

Probably an API change has caused the author field to include
additional information. For example, I am getting

    username@domain.tld (Display Name)

And the part in the brackets causes a mismatch with the return-path.
I have decided to just remove this check completely, because writing
a regex that correctly extracts the email address, while covering all
corner cases, seems too complicated (cf. <https://stackoverflow.com/a/201378>).

Revert setting attentionForAll to true.