Suppressions

The system automatically manages four core lists: Complaint List, Block List, Bounce List, and Unsubscribe List.

Complaint List

Trigger Conditions:

• When a recipient marks an email as "spam" in their mail client
• Some mailbox providers (like QQ Mail and Gmail) provide complaints via FBL (Feedback Loop) reports in ARF format

Handling Mechanism:

• Reported addresses are automatically added to the Complaint List
• Validity Period: 180 days
• Sending to addresses on this list during the validity period returns the error: "Blacklist:complaint (worker:address in complaint list)"

Management Suggestions:

• Filter complaint data by time period
• Manual deletion is supported but generally not recommended
• Avoid sending to complained users to prevent further negative perception

Block List

Function:

• Manually upload specific email addresses or domains to block
• Sends to blocked addresses return the error: "Blacklist: Block：(worker:address in block list)"

List Data Includes:

• Email Address / Domain
• Associated API_USER
• Creation Time, Expiration Time

Use Cases:

• Proactively block invalid or high-risk addresses
• Implement custom sending policies

Bounce List

Trigger Mechanism:

• Recipient address does not exist (mailbox provider returns "address does not exist")
• System automatically blocks subsequent sends, returning: "Blacklist: Bounce(worker:address in bounce list)"

Expiration Rules:

n = Number of times a "non-existent address" bounce is received for that mailbox.

Key Advantages:

• Emails failing due to "Blacklist: Bounce" are not charged
• Effectively filters invalid addresses, helping maintain sending reputation
• Supports querying and setting specific addresses to not be blocked

Unsubscribe List

Description:

• Records the time and reason provided by users who unsubscribe
• Subsequent sends to unsubscribed addresses return the invalid reason: "unsubscribe"

Unsubscribe Reason Categories:

• I don't want to receive such mail anymore
• This is not my subscription
• This is spam
• This is a fraudulent email

Value:

• Respects user choice and maintains brand reputation
• Avoids unnecessary sends, reducing costs

💡Best Practices

Data Monitoring:

• Regularly review list data to analyze sending quality
• Monitor complaint rates and optimize sending strategies accordingly

Sending Optimization:

• Use the Bounce List to clean your address database
• Respect unsubscribed users; avoid aggressive remarketing
• Handle complained addresses carefully to protect sender reputation

List Management:

• Use the custom Block List feature judiciously
• Understand the expiration policies for different lists
• Establish a proactive address hygiene process

User Guide

Data Querying:

• Filter entries by email address and time range
• View detailed trigger reasons and timestamps

List Management:

• Export list data for analysis
• Manually delete specific entries (use cautiously)