The Kintera Blacklist is a suppression list of email addresses which fail delivery a consecutive number of times, and is one of several types of suppression (an automatic process Sphere uses to remove email addresses from a list of bulk email receivers) we use. The numbers of times delivery can fail depends on the failure categories (see table below) assigned to the bounce codes email service providers send Sphere when messages are sent:

  • When failure codes indicate the failure is not related to the email address, Sphere always attempts to deliver future mailings (for example, if the email service provider blocks the email delivery).
  • When the failure codes indicate the failure is related to the email address but could be temporary, Sphere allows a specific number of future attempts for each category (for example, after receiving five consecutive failure codes indicating a mailbox is full, Sphere will not send a sixth message). Sending additional times could result in the email service provider blocking the message.
  • When the failure codes indicate the failure is technical and not related to Sphere’s sending system, Sphere allows a specific number of future attempts. Also, Sphere automatically resends the current message up to four times over a given period of time after sending the initial message in an attempt to receive a success code (for example, after receiving a failure code indicating an email service provider’s system is busy, Sphere resends the current message – if the resend does not result in a success code, Sphere allows six future attempts for other mailings).
  • When the failure codes indicate the failure is permanent, Sphere automatically suppresses the email address from future mailings (for example, the email service provider indicates the email address is for an unknown user).

Failure Category

Failure Type

# of Consecutive Failures Triggering Kintera Blacklist Suppression

Spam Complaint

Soft Fail

Never

Blacklist

Soft Fail

Never

ISP Block

Soft Fail

Never

Content Block

Soft Fail

Never

URl Block

Soft Fail

Never

Excess Traffic

Soft Fail

Never

Security Violation/Virus

Soft Fail

Never

Open Relay

Soft Fail

Never

List Mgt

Soft Fail

Never

Authentication

Soft Fail

Never

Other

Soft Fail

Never

User Initiated Block

Soft Fail

Never

Unknown User

Hard Fail

1

Bad Domain

Hard Fail

1

Address Error

Hard Fail

1

Closed Acct

Hard Fail

1

Other

Hard Fail

1

Mailbox Full

Soft Fail

5

Inactive/Disabled Acct

Soft Fail

5

Greylist

Soft Fail

5

Server Too Busy

Soft Fail

5

Other

Soft Fail

5

Data Format Error

Soft Fail

7

Network Error

Soft Fail

7

Other Receiver Error

Soft Fail

7

User Initiated Action

Soft Fail

7

Other

Soft Fail

7

Network of Configuration Error

Soft Fail

7

Unknown

Soft Fail

10