A feedback loop is a data feed set up by Internet service providers (ISP) which forwards complaints originating from their users back to the sender of the original message. This complaint data is then processed by the sender so they can remove and/or permanently unsubscribe the user from the list (or lists) in question. This helps to avoid future complaints, which can seriously affect delivery.
It also gives ESPs (Email Service Providers) the ability to keep track of how many complaints are received for a given client (or campaign) so they can take the appropriate action.
People who generate a lot of complaints can cause many problems with delivery, especially if they are part of a shared IP pool used by multiple customers.
On average, a complaint rate over 0.25% (1 in 400) at any given ISP for a given mailing, is considered a problem.
Under your contact activities in your delivered campaign, you will be able to filter FBL’s by providers. These include:
Microsoft
Comcast
Hotmail
Yahoo!
AOL
LaPoste
Yahoo! UK
Mail.ru
Synacor
Rackspace
United Online
Rogers
Hover
FastMail
Tucows (OpenSRS)
BOL
Terra Brasil
Earthlink
Cox
Seznam.cz
Yahoo! HK
Google Apps
Verizon
ItaliaOnLine
WindStream
BlueTie
USA.net
Libero.it
Yandex
Ziggo
Cable ONE
Virgin
Gmail
BigPond
RCN
WOW!
Cincinnati Bell
Globo
Yahoo! TW
Free.fr
Spam Experts
EdgeWave
McAfee
GoDaddy
Office 365
Barracuda
Symantec
Videotron
ATT
DreamHost
IBM SmartCloud Notes
Network Solutions
PenTeleData
Everyone.net
One.com
SpamExperts
Spray
Telstra
Zoho
How we calculate the complaint rate:
total number of complaints / total number of email sent to the FBL domains
It is not divided by the total number of emails sent as this would not give the most accurate representation of your true complaint rate at each ISP.
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