Authorized Email Address Checks

I noticed that the Authorized Email functionality is case sensitive.

(Ex: If I put in an Email of Admin(at)domain.com versus admin(at)domain.com, 2 things happen):
1) When entered into a Newsletter’s senders address, it doesn’t convert case to lower or upper (it stays as is).
2) When I go to create an Authorized Email within the MailPoet Admin site, it forces the email address to lower.

I think there’s 3 ways to solve this:
a) When checking if email is authorized, downcase both sides of the compare.
or
b) Force all emails entered on Newsletters to lowercase (this way they will match the authorized email address)
or
c) Allow the Admin Authorize screen to accept mixed-case email addresses.
I believe option (a) would be best as emails are usually handled case-insensitive, so this way all your compares would be against lowercase.

Regards,
Steve D.