On Dec 31, 2015 version 1.1 of this add-on was released to address an exploitable SQL injection vulnerability. If you are still using a version of this add-on which is below 1.1 or released before Dec 31, 2015 then it is essential that you update to the latest version of the add-on as soon as possible to fix this security issue.
Daily Digest v2.0 changes:
Updated PHP code to fix issue with Exclude Forums option.
Daily Digest v1.9 changes:
1) Emails are sent only if there are new threads.
2) Phrase updated.
Daily Digest v1.8 changes:
Previous version (v1.7) had a problem with the PHP file and was not sending out emails on some servers. Please upgrade to v1.8.
Daily Digest v1.5 changes:
Censoring function now honored. Thread titles and links now censored in the email being sent.
Admin Control Panel -> Options -> Censoring -> Words to Censor