Email seems to be using site name as address

After enabling and creating a new article, I ran the drush cron to send the notifications. I received these messages (edited for privacy):

in_array() expects parameter 2 to be array, null given notify.module:743                                     [warning]
exim: bad -f address "Your Sitename": missing or malformed local part (expected word or "<")
Error sending email (from webmaster@sitename.com to webmaster@sitename.com with reply-to not   [error]
set).
in_array() expects parameter 2 to be array, null given notify.module:743                                     [warning]
exim: bad -f address "Your Sitename": missing or malformed local part (expected word or "<")
Error sending email (from webmaster@sitename.com to youruser@yourplace.com with reply-to not set).  [error]
Cron run successful.                                                                                         [success]
Unable to send email. Contact the site administrator if the problem persists.                                [error]

I got this error for each of my users. There may be two issues here or they may be part of the same thing. It seems that the reply-to address is either not set at all or is set to the Site Name with an expected email address after it in <>

For example:
Site Name <site_email@site.com>

Regardless, the notification did not reach my users, even though the logging message (in /admin/reports/dblog) did say it was successfully sent:
User Your User (youruser@yourplace.com) notified successfully.

The same errors that appeared above appear in logging as well, but the exim messages did not.