FBL Processing

FBL Processing

FBL Processing

FBL stands for “Feedback Loop”. As an email marketer, it’s a good approach to get enrolled in ISP FBL programs. In this way, you will get notified every time a SPAM complaint is reported by one of your recipients. This FBL reports must be processed and following actions must be taken:

  • Identify the SPAM complaint owner recipient
  • Unsubscribe from your lists
  • Add to the suppression list
  • Make sure you never send an email to that recipient
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WARNING: Sending emails to recipients who have filed a spam complaint will damage your delivery reputation, get your IP addresses and send domains black listed. Just like bounce processing, FBL processing is very crucial to keep your email delivery reputation consistent and in good standing.

FBL Program Application

In order to receive FBL reports, you must apply for individual FBL programs for each ISP you are sending to. Under “ISP Information” section, you can find the list of ISP’s that offer Feedback Loop programs. Start from the #1 ISP used by your audience and start applying to all major ones to make sure you have wide FBL coverage.

FBL Processing

Once the FBL program application is completed, the next step is to process them. When applying to FBL programs, you will be asked to enter an email address to receive FBL email addresses. Make sure that you have a separate mailbox dedicated to FBL reports. For example, you can setup a mailbox such as fbl@yourdomain.com and set it in FBL program enrollments.

The next step is to start processing received FBL reports. Processing can be done by Octeth, by PowerMTA or any other third party software/service. In this chapter, we described how to perform FBL processing by Octeth and PowerMTA.

Octeth

Octeth can connect to your FBL mailbox and process received FBL reports. To enable this feature, go to [Admin Area → Settings → Email Delivery → SPAM Complaints] tab:

FBL report processing settings can be found in the admin area → settings section.
FBL report processing settings can be found in the admin area → settings section.

In this section, you can define email addresses and other settings related to the Spam Complaint and FBL processing.

SPAM Complaint Settings

NameDescription
Abuse Reports
Enter the email address you would like to receive abuse and spam complaints. This email address will not be disclosed publicly.
Complaints
This email address will be added to outgoing email headers as “x-complaints-to”. Do not set your personal email address for this setting. In order to align domains inside outgoing emails, you can use %sender_domain% merge tag to make sure the complaints email address is always the same with the sender domain. Example: complaints@%sender_domain%
FBL Email
The email address which has been submitted to FBL programs such as Outlook JMRP, Google FBL, etc.
List Unsubscribe Email
The email address set here will be added to outgoing email “list-unsubscribe:” headers. List-unsubscribe header email address (or URL) receives a copy of the unsubscription request processed by the ESP. If you leave this field empty, Oempro will set the list-unsubscribe email address to the MFROM sender domain set in the Delivery Server settings.
Monitoring Method
Choose POP3/IMAP and enter connection parameters. “Email Piping/CLI” option will be deprecated in future versions.

Choose “POP3/IMAP Connection” option for the “Monitoring Method” setting. Once it’s chosen, you will be asked to enter connection parameters for the FBL mailbox. Enter the IMAP host, port, username and password of your FBL report mailbox. Octeth will start processing incoming FBL reports and detected ones will be registered to the system:

  • The spam complaint owner recipient will be unsubscribed from the list
  • The spam complaint owner recipient will be added to the suppression list

PowerMTA

You may prefer PowerMTA to process incoming FBL reports instead of Octeth. In such case, you must point your FBL email address MX server to your PowerMTA server and peform a set of configuration in the PowerMTA configuration file.

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For more information about PowerMTA inbound email and FBL processing, please refer to PowerMTA’s documentation (chapter 12).

First of all, you must enable “relaying” for the FBL email address domain. To do this, set the following directive in PowerMTA configuration:

relay-domain yourdomain.com

To enable Feedback Loop report processing, set the following directive:

<feedback-loop-processor>
	deliver-unmatched-email no
	deliver-matched-email yes # default: no
	forward-unmatched-to youremail@yourdomain.com
	forward-errors-to youremail@yourdomain.com
	<address-list>
		address /fbl@fbl.yourdomain.com/
	</address-list>
</feedback-loop-processor>

In order to log received FBL reports, enable reporting:

<acct-file /var/log/pmta/fbl.csv>
	records feedback-loop
	record-fields f *,header_X-HmXmrOriginalRecipient
</acct-file>

The best approach to setup FBL email address on your domain is to set a subdomain and point MX records to your PowerMTA server.

If your PowerMTA server is running on 100.100.100.100 IP address, and if your corporate domain is mydomain.com, we recommend you the following setup:

fbl.mydomain.com MX 100.100.100.100

Feedback Loop Email Address: fbl@fbl.mydomain.com

PowerMTA and Octeth FBL Integration

Received FBL reports will be logged into /var/log/pmta/fbl.csv file if you have followed instructions above. This CSV file can be processed and logged email addresses can be added to the global suppression database of Octeth. In this way, these email addresses will be removed from all future email campaign deliveries and you will be in good standing.

ISP Information

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The ISP information list on this page has been taken from Word To The Wise Blog. Please visit Laura’s blog to get access to the most up-to-date information regarding ISP’s.

Last updated on 8th May 2022

ISPPostmaster siteFeedback LoopWhitelistSupport
AOL
Whitelist Signup
AT&T
does not offer
does not offer
Bellsouth (AT&T)
does not offer
does not offer
Charter
does not offer
does not offer
Comcast
does not offer
Cox
does not offer
Earthlink
does not offer
Excite
does not offer
does not offer
Fastmail
GMX
Gmail
does not offer
Hotmail (Outlook)
Integra
does not offer
does not offer
does not offer
Juno
Live.com (Outlook)
Mail.com
does not offer
does not offer
Mail.ru
Netzero
Office365
OpenSRS
Outlook
does not offer
QQ
does not offer
does not offer
Rackspace
does not offer
Roadrunner
does not offer
Synacor
Telenor
Terra.com.br
Time Warner Cable
Tucows
does not offer
does not offer
does not offer
United Online
does not offer
Whitelist Signup
Usa.net
does not offer
Verizon
does not offer
Whitelist Signup
does not offer
Yahoo
Yahoo! Mail Bulk Sender Form
XS4ALL
Zoho

Email Delivery and Filtering Details

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The Email Delivery and Filtering list on this page has been taken from Word To The Wise Blog. Please visit Laura’s blog to get access to the most up-to-date information regarding ISP’s.

Last updated on 8th May 2022

ISPConnection LimitsSending LimitsCertificationReputation Providers
500 emails per connection100 recipients per message
Return Path Certified
no published limits
no published limits
Return Path Certified
no published limits
no published limits
no published limits
no published limits
no confirmed
25 connections per IP address
100 recipients per message
Return Path Certified
Spamhaus Spamhaus ZENCloudmark CSIReturn Path Reputation Network Blacklist.
5 connections per IP address
100 messages per connection
Return Path Certified
does not publish
does not publish
no known certification services
10 per IP
10 per connection
Return Path Certified
Spamhaus XBLSpamassassin
does not publish
not using any
based on the reputation
based on the reputation
Return Path Certified
no published limits
100 emails per address
very little information available
very little information available
has not published
500 simultaneous connections
1 connection per IP
1 email per connection
very little information available
very little information available
Return Path Certified
has not published
do not publish
do not publish
Return Path Certified
very little information available
very little information available
Return Path Certified
has not published
does not publish
does not publish
Return Path Certified
Cloudmark
Return Path Certified
not known to use
20 emails per connectionreputation based rate limiting
Return Path Certified
Spamhaus XBLSpamhaus PBL

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