Should I suppress soft bounces from my email lists for better list hygiene?

Summary

Managing soft bounces is crucial for maintaining a healthy email list and good deliverability. While immediate removal of hard bounces is universally recommended, a nuanced approach is advised for soft bounces. Experts caution against blanket suppression solely based on the 'soft bounce' label, emphasizing the importance of understanding the underlying error codes. Soft bounces can arise from temporary issues, reputation problems (like Yahoo rate limiting), or other deliverability challenges. Many suggest monitoring, segmenting, and retrying sends to soft bounces a limited number of times before suppression. Persistent soft bounces, if left unmanaged, can damage sender reputation and lead to deliverability issues. Proactive list management and addressing high mailbox full bounces are also emphasized. The general consensus is that analyzing error codes, understanding soft bounce reasons and considering ESP settings, and managing your list proactively will improve sender reputation.

Key findings

  • Impact: High bounce rates (including persistent soft bounces) negatively impact sender reputation and email deliverability.
  • Error Codes: Understanding the underlying error codes associated with soft bounces is crucial for effective management.
  • Need for Strategy: A tailored approach is needed for managing soft bounces involving monitoring, segmentation, and selective suppression.
  • Reputation Risk: Leaving soft bounces unmanaged poses a reputational risk for senders.
  • ESPs: ESPs might handle soft bounces differently, and their settings should be considered.

Key considerations

  • Type of Soft Bounce: Distinguish between different types of soft bounces (temporary issues, reputation problems, etc.) for targeted action.
  • Retry Attempts: Decide on the number of retry attempts for soft bounces before considering suppression.
  • List Health: Evaluate list health and engagement levels when handling high mailbox full bounces.
  • Segmentation: Segment soft bounces based on reason for more targeted management.
  • Suppression Threshold: Establish a clear threshold for persistent soft bounces before suppression.

What email marketers say
11Marketer opinions

The general consensus among email marketers is that managing soft bounces is crucial for maintaining a healthy email list and good deliverability. While hard bounces should be immediately removed, soft bounces require a more nuanced approach. Many suggest monitoring and segmenting soft bounces, retrying sends a limited number of times, and suppressing them if they persist. High bounce rates, including persistent soft bounces, can damage sender reputation, leading to deliverability issues. Proactive list management, including removing inactive contacts and addresses generating frequent soft bounces, improves deliverability and ensures emails reach engaged recipients.

Key opinions

  • Negative Impact: High bounce rates (including soft bounces) negatively impact sender reputation and email deliverability.
  • Suppression Improves Deliverability: Suppressing persistent soft bounces improves deliverability and campaign performance.
  • Proactive List Management: Actively managing email lists and removing inactive or problematic addresses is essential.
  • General recommendation: Most email marketers agree that you should suppress soft bounces to better your email score.

Key considerations

  • Frequency of Bounces: Determine the threshold for soft bounces before suppression (e.g., after 3 attempts).
  • Mailbox Full Issues: Investigate causes of high mailbox full bounces, considering list health and engagement.
  • Engagement of Subscribers: Consider subscriber engagement levels when deciding whether to suppress soft bounces.
  • ESPs: Different ESP's manage soft bounces differently and their settings should be configured.
Marketer view

Email marketer from Reddit shares that after three soft bounces, they would consider suppressing an address. They explain that repeatedly sending to addresses that soft bounce can negatively impact your sending reputation, making it more difficult to reach valid recipients.

February 2024 - Reddit
Marketer view

Email marketer from Email Marketing Forum explains that it is a best practice to suppress soft bounces after a few attempts. This prevents you from being seen as a spammer.

August 2021 - Email Marketing Forum
Marketer view

Marketer from Email Geeks shares that they convert soft bounces from 3 email sends into hard bounces, based on analysis showing these addresses rarely interact and are likely permanent failures.

September 2023 - Email Geeks
Marketer view

Email marketer from HubSpot suggests that actively managing your email list to remove inactive contacts and addresses that generate hard or frequent soft bounces can improve your sender reputation and email deliverability. This proactive approach helps to ensure that your emails reach engaged recipients.

February 2024 - HubSpot
Marketer view

Email marketer from Litmus explains that actively monitoring soft bounces is crucial. Litmus advocates for a strategy that includes identifying the causes of soft bounces, segmenting these addresses, and suppressing those that consistently soft bounce to protect sender reputation and improve overall campaign performance.

February 2024 - Litmus
Marketer view

Email marketer from Moosend explains that a high bounce rate damages sender reputation, leading to deliverability issues. Therefore, cleaning lists by removing invalid email addresses (which contribute to bounces) is crucial for maintaining a healthy list and good deliverability.

June 2021 - Moosend
Marketer view

Email marketer from Neil Patel's Blog explains that a high bounce rate damages sender reputation, leading to deliverability issues. Therefore, cleaning lists by removing invalid email addresses (which contribute to bounces) is crucial for maintaining a healthy list and good deliverability.

May 2022 - Neil Patel's Blog
Marketer view

Email marketer from Active Campaign suggests actively maintaining your list including suppression of persistent soft bounces will improve sender reputation.

July 2024 - Active Campaign
Marketer view

Email marketer from Email Geeks suggests that high mailbox full bounces warrant a review of list health and engagement. Factors such as subscription confirmation and prior engagement should be considered.

February 2025 - Email Geeks
Marketer view

Email marketer from Email on Acid shares that while hard bounces should be immediately removed, soft bounces require a more nuanced approach. They suggest segmenting and monitoring soft bounces, retrying sends to these addresses a limited number of times, and suppressing them if they continue to bounce. This prevents deliverability issues caused by repeatedly sending to problematic addresses.

June 2023 - Email on Acid
Marketer view

Email marketer from Campaign Monitor details the importance of list hygiene including addressing bounced email addresses that are non-responsive to emails and should be removed to maintain list hygiene.

July 2021 - Campaign Monitor

What the experts say
5Expert opinions

Experts emphasize a nuanced approach to managing soft bounces, cautioning against blanket suppression based solely on the 'soft bounce' designation. Understanding the underlying error codes is crucial, as soft bounces can stem from various reasons, including temporary issues, reputation problems, or rate limiting by providers like Yahoo. Blindly suppressing all soft bounces risks losing valid addresses. Some experts suggest that ESP's default settings are generally adequate. Distinguishing between consecutive vs lifetime soft bounces and identifying the root cause of the soft bounce is important. Some 'soft bounces' might be a symptom of deeper deliverability problems.

Key opinions

  • Context Matters: The reason behind the soft bounce is more important than the label itself.
  • Deeper Issues: Soft bounces can indicate underlying reputation or authentication problems.
  • Yahoo Consideration: Yahoo soft bounces for reputation; suppressing them all can be detrimental.
  • ESP Settings: ESPs might already handle soft bounces adequately through default settings.

Key considerations

  • Error Codes: Analyze error codes to understand the nature of soft bounces (temporary, permanent, reputation-related).
  • Consecutive vs. Lifetime: Distinguish between consecutive and lifetime soft bounces for a more accurate assessment.
  • Temporary Failures: Consider temporarily withholding soft bounces and retrying later, as some issues may resolve.
  • Risk of Oversuppression: Be cautious about suppressing all soft bounces, as this can lead to the loss of valid email addresses.
Expert view

Expert from Email Geeks warns that Yahoo may soft bounce for reputation reasons, and removing all contacts who soft bounce due to rate limiting could result in losing a significant portion of the list, even if the addresses are valid.

February 2024 - Email Geeks
Expert view

Expert from Email Geeks explains the importance of distinguishing between consecutive and lifetime bounces when managing lists. They suggest temporarily withholding soft bounces from mailings for a week and retrying later, as mailbox full issues may resolve.

December 2022 - Email Geeks
Expert view

Expert from Word to the Wise explains that distinguishing between temporary and permanent failures is key and that suppression based on broad categories like 'soft bounce' is risky. You need to understand the actual error codes to make informed decisions about suppression, as some 'soft bounces' might indicate serious deliverability problems, while others are transient.

December 2022 - Word to the Wise
Expert view

Expert from Email Geeks suggests that while ESPs may handle soft bounces differently, their default settings are generally adequate, and it's often best to rely on them unless a specific problem arises.

June 2024 - Email Geeks
Expert view

Expert from Word to the Wise says the best answer is 'it depends.' She explains that the error codes are more important than the designation as a hard or soft bounce. Some soft bounces are a temporary error, some soft bounces are a slow bounce or a greylist bounce. She goes on to explain that soft bounces due to authentication or reputation issues may mean there is a more fundamental problem that can have a negative impact on your program.

January 2022 - Word to the Wise

What the documentation says
4Technical articles

Email service documentation generally advises monitoring both hard and soft bounces. Hard bounces should be immediately suppressed due to permanent delivery failure. Soft bounces, being potentially temporary, require careful management. Persistent soft bounces should be suppressed as they can negatively impact sender reputation. Maintaining acceptable bounce rates is essential for avoiding deliverability issues.

Key findings

  • Monitor Both: Both hard and soft bounces require monitoring.
  • Hard Bounce Suppression: Hard bounces should be immediately suppressed.
  • Persistent Soft Bounce Suppression: Persistent soft bounces should be suppressed.
  • Impact on Reputation: Unmanaged bounces negatively impact sender reputation.

Key considerations

  • Threshold for Persistence: Determine the number of attempts before suppressing soft bounces.
  • Monitoring System: Implement a system to effectively monitor and track bounce rates.
  • Reputation Management: Proactively manage bounces to maintain a positive sender reputation.
  • Deliverability Impacts: Consider the potential deliverability impacts of not addressing soft bounces.
Technical article

Documentation from SendGrid explains that both hard and soft bounces should be monitored. Hard bounces should be immediately suppressed as they indicate permanent delivery failures. Soft bounces, while temporary, should be monitored and suppressed if they persist, as repeated soft bounces can also negatively impact sender reputation.

August 2021 - SendGrid
Technical article

Documentation from Mailchimp explains that cleaning your email list involves removing unsubscribed, inactive, and bounced email addresses. They explain that removing hard bounces immediately is important, and advise monitoring and potentially removing soft bounces after a certain number of attempts, to improve deliverability and engagement.

December 2024 - Mailchimp
Technical article

Documentation from Amazon Web Services (AWS) explains the importance of handling bounces effectively to maintain a good sender reputation. They highlight the need to immediately remove hard bounces and carefully manage soft bounces, with a recommendation to suppress persistent soft bounces to avoid deliverability penalties.

November 2023 - Amazon Web Services
Technical article

Documentation from Microsoft details that as a sender you should monitor your hard and soft bounce rates and ensure you adhere to the bounce thresholds to avoid deliverability issues.

April 2022 - Microsoft