From time to time, you may see a red number show up in the "Complaints" column on the Email Campaign Statistics screen or when you drill further down into the statistics of a particular campaign.
These "Complaints" are generated when an email recipient marks the email as “This is Spam” in some form or fashion.
This situation results in our servers receiving a code from the recipients ESP that signals our server to mark the message as a "Complaint."
Some providers, such as GMAIL and HOTMAIL do not currently provide a feedback loop to our servers for Complaints; thus, complaints by recipients using these ESPs will not show up in our Complaints Statistics.
We do not provide the details, such as email address, of the persons who complained due to Regulatory Guidelines.