How often should email seed tests be performed for inbox placement monitoring?

Summary

The frequency of email seed tests for inbox placement monitoring is a nuanced issue with several contributing factors. Experts and email marketers generally agree that testing for every campaign is not necessary and can be detrimental. The ideal frequency depends on sending volume, risk tolerance, the reputation of your IP and domain, and the type of emails being sent (transactional vs. promotional). High-volume senders and those with critical deliverability needs might test daily, while lower-volume senders can test weekly. New IPs and domains should test more frequently initially. Seed data is most valuable when analyzed over time to identify trends, rather than for individual campaigns. A consistent email marketing strategy that integrates seed tests as part of a broader deliverability monitoring approach is recommended.

Key findings

  • Avoid Over-Testing: Testing for every campaign can be seen negatively by ISPs.
  • Volume & Risk Tolerance: High sending volume and a low risk tolerance necessitate more frequent testing.
  • New vs. Established: New IPs and domains require more frequent monitoring initially.
  • Transactional vs. Promotional: Transactional emails need less frequent testing than promotional campaigns.
  • Trending, not Campaign Specific: Seed data is best used for identifying trends over time, not evaluating individual campaigns.
  • Part of a Broader Strategy: Seed testing should be one component of a comprehensive email deliverability strategy.

Key considerations

  • Sending Volume: How many emails are you sending per day/week?
  • Deliverability Importance: How critical is deliverability to your business goals?
  • IP/Domain Reputation: What is the existing reputation of your sending IP and domain?
  • Email Type: Are you sending primarily transactional or promotional emails?
  • Data Analysis: How will you analyze seed data to identify trends and issues?
  • Consistency: Be consistent with your seed testing practice.
  • Reputation Build Time: Reputation engines take time to shift, so testing constantly will not gain you much and may harm.

What email marketers say
8Marketer opinions

The optimal frequency for email seed tests varies based on several factors. Experts generally advise against running seed tests for every campaign, as ISPs might perceive it negatively. Instead, the frequency should align with the sending volume, risk tolerance, and the purpose of the tests. High-volume senders or those with critical deliverability needs may test daily, while lower-volume senders can test weekly. Consistent email marketing practices and incorporating seed lists as part of a broader testing strategy are crucial for maintaining good inbox placement.

Key opinions

  • Avoid Excessive Testing: ISPs may penalize senders who perform seed tests for every campaign.
  • Frequency Varies: Testing frequency should align with sending volume and risk tolerance; higher volumes may require daily tests.
  • Consistency is Key: Consistent email marketing practices enhance inbox placement over time.
  • Part of Broader Strategy: Seed lists should be incorporated with other testing methods for a responsible email program.

Key considerations

  • Sending Volume: Higher sending volumes may necessitate more frequent seed tests.
  • Risk Tolerance: If deliverability is critical, more frequent testing may be warranted.
  • ISP Perception: Avoid excessive testing to prevent negative perception from ISPs and spam filters.
  • Testing Strategy: Incorporate seed lists as part of a holistic email testing strategy for best results.
  • Reputation Build Time: Reputation engines take time to shift, so testing constantly will not gain you much and may harm.
Marketer view

Email marketer from Reddit shares in a thread that excessive seed list testing can be perceived negatively by ISPs and spam filters. They advise using them sparingly and focusing on other deliverability best practices.

October 2023 - Reddit
Marketer view

Email marketer from Postmark shares that your frequency depends on email volume. If sending less emails, less seed tests are needed, but if sending a lot, you may need more to ensure deliverability.

September 2021 - Postmark
Marketer view

Marketer from Email Geeks shares that sending seed tests for every campaign is not good, as ISPs may notice and complain. They suggest selecting the most important campaigns for seed testing, as reputation engines take time to shift and constant testing may harm. They advise being consistent in your practice for reliable data signals.

May 2021 - Email Geeks
Marketer view

Email marketer from EmailToolTester shares that consistent email marketing practices, including regular sending and monitoring of deliverability metrics through tools like seed lists, contribute to better inbox placement over time.

December 2023 - EmailToolTester
Marketer view

Email marketer from Mailtrap Blog explains that you don't need to run seed list tests for every email. They advise to run them weekly if you send a few times a week, or daily if you send numerous times a day and want to be extra careful.

May 2022 - Mailtrap Blog
Marketer view

Email marketer from ZeroBounce advises to consider your sending frequency and risk tolerance when setting up seed list testing intervals. If you send daily, testing daily may be warranted but weekly is fine for lower volume senders.

April 2021 - ZeroBounce
Marketer view

Email marketer from SendGrid suggests that using seed lists should be part of any responsible email program. They should be incorporated with other testing and not relied upon by themselves.

November 2024 - SendGrid
Marketer view

Email marketer from Litmus explains that regular email testing, which includes inbox placement monitoring via seed lists, helps identify and address deliverability issues proactively, improving overall campaign performance.

July 2024 - Litmus

What the experts say
3Expert opinions

The frequency of email seed tests for inbox placement monitoring depends on several factors, including sending volume, IP/domain reputation, and the type of email. Smaller senders sending a few times a week should test with similar frequency, while transactional emails require even less frequent testing. New IPs/domains benefit from more frequent testing initially, with established senders able to reduce testing frequency. Seed data is best analyzed over time to identify trends and directional changes rather than for immediate campaign monitoring.

Key opinions

  • Smaller Senders: Smaller senders should test with similar frequency to their sending schedule (e.g., once or twice a week).
  • Transactional Emails: Transactional emails need less frequent testing (once or twice a week).
  • New vs. Established: New IPs/domains require more frequent testing; established senders can reduce testing.
  • Trending Data: Seed data is more useful for identifying trends and directional changes over time.

Key considerations

  • Sending Volume: Adjust testing frequency based on how often you send emails.
  • IP/Domain Reputation: Consider the age and reputation of your IP and domain when determining testing frequency.
  • Type of Email: Transactional emails may not require as frequent testing as promotional emails.
  • Analysis Method: Analyze seed data over time to identify trends rather than relying on single-campaign results.
  • Inbox placement health: Consistently bad inbox placement also warrants increased monitoring.
Expert view

Expert from Word to the Wise shares that seed data is best used for trending and directional changes, not specific campaign placement monitoring. Review seed data over time rather than after each send.

July 2021 - Word to the Wise
Expert view

Expert from Email Geeks explains that for smaller senders sending once or twice a week, seed tests should be conducted with similar frequency. Transactional emails should not be tested more than once or twice a week.

February 2024 - Email Geeks
Expert view

Expert from Spam Resource explains that the need to monitor inbox placement varies. New IPs and domains should perform more testing, while established senders can reduce testing frequency, and consistently bad inbox placement also warrants increased monitoring.

September 2021 - Spam Resource

What the documentation says
4Technical articles

Email deliverability documentation consistently emphasizes the importance of monitoring inbox placement through methods like seed list testing. The recommended frequency for these tests is generally aligned with sending volume and risk tolerance. High-volume senders and those for whom deliverability is critical should test more frequently, potentially even daily. Regular monitoring helps identify deliverability issues and informs adjustments to sending practices.

Key findings

  • Importance of Monitoring: Regular monitoring of email deliverability, including seed list testing, is crucial for good inbox placement.
  • Align with Volume: Testing frequency should align with sending volume; high-volume senders should test more often.
  • Risk Tolerance Matters: Those with critical deliverability needs should test more frequently, possibly daily.
  • Identify Problems: Regular monitoring helps identify and address deliverability issues proactively.

Key considerations

  • Sending Volume: Determine testing frequency based on how many emails you send.
  • Critical Deliverability: Assess how critical email deliverability is to your business.
  • Performance Monitoring: Regularly monitor your deliverability performance and adjust testing frequency accordingly.
  • Proactive Approach: Implement a system where testing helps identify issues proactively.
Technical article

Documentation from GlockApps explains that the frequency of seed list testing depends on your sending volume and how critical deliverability is for your business. High-volume senders and those with critical deliverability needs should test more often, possibly daily.

August 2023 - GlockApps Knowledge Base
Technical article

Documentation from Mailjet explains that regularly monitoring email deliverability, including through seed list testing, is crucial for maintaining good inbox placement. They recommend adjusting testing frequency based on sending volume and performance.

February 2023 - Mailjet Documentation
Technical article

Documentation from Microsoft suggest that regular monitoring of email deliverability using tools like seed lists can help identify problems. They don't advise on testing frequency but the importance of the process.

April 2024 - Microsoft
Technical article

Documentation from SparkPost explains that seed lists can be used to monitor inbox placement. Testing frequency should align with sending volume and risk tolerance. High-volume senders may test more frequently than low-volume senders.

August 2021 - SparkPost Documentation