This Fixes #900
This Fixes #900

Missed this function while merging
This Fixes #900

Added dependency for sendmailR package
This Fixes #900
This Fixes #900

Added entry for sendmailR package in imports.
This Fixes #900 : Formatting correction for spaces
This Fixes #900 : Defaulted the comment notification subscription to false.
This Fixes #900: added space.
This Fixes #900: Again fixing merge issue
Merge pull request #1119 from sujitbehera27/comment-notify-900

New PR  which Fixes #900 for comment notification to users.