What deliverability and compliance tools should a new ESP implement?

Summary

A new Email Service Provider (ESP) should implement a comprehensive suite of deliverability and compliance tools and practices. Foundational to this is email authentication via SPF, DKIM, and DMARC, which prevents spoofing and ensures message integrity. Monitoring IP and domain blocklists, using tools like Hetrix and Spamhaus, allows for proactive issue detection. Active management of sender reputation through dedicated IPs and a gradual IP warm-up is crucial. Effective complaint handling, coupled with the use of feedback loops, helps to identify and address deliverability issues. Building a strong Abuse/Compliance desk with technical support is vital. Additional measures include using prospect vetting checklists, clawback commissions to disincentivize spammy clients, providing unsubscribe feedback options, and regularly monitoring inbox placement, testing email content, and cleaning lists. Segmentation and data analysis, using Google Postmaster Tools or similar systems, provide further insights. Finally, strong internal policies that sales understand and that prevent side-letter agreements are recommended.

Key findings

  • Email Authentication: SPF, DKIM, and DMARC are foundational for email authentication and preventing spoofing.
  • Reputation Monitoring: Proactive monitoring of IP and domain blocklists, as well as sender reputation, is crucial for identifying and addressing issues promptly.
  • Complaint Management: Effective handling of complaints and the utilization of feedback loops are vital for maintaining a positive sender reputation.
  • Compliance Desk: An empowered Abuse/Compliance desk with strong technical support is essential for managing deliverability challenges.
  • Data-Driven Decisions: Regular data analysis is key to identifying problems and patterns and addressing them. Postmaster Tools are helpful.
  • Client Vetting and Incentives: Implementing a vetting process for new prospects and clawback commissions can minimize abuse.

Key considerations

  • Holistic Approach: A successful deliverability strategy requires a holistic approach combining technical, procedural, and organizational measures.
  • Data Analysis Importance: Be sure to implement data gathering/analysis and automated alerting for changes.
  • Compliance Empowerment: The Compliance/Abuse Desk needs to be seperate from normal CS and empowered to act.
  • Sales Buy-In: Ensure that Sales fully understands and is incentivized to ensure compliance.
  • Dynamic Adaptation: The email landscape is constantly evolving, so the ESP should remain up-to-date on best practices and adapt accordingly.
  • Blacklist Monitoring: Consistently watch if the ESP's IPs are blacklisted.

What email marketers say
15Marketer opinions

New email service providers (ESPs) should prioritize deliverability and compliance by implementing a range of tools and practices. These include authentication methods (SPF, DKIM, DMARC), prospect vetting checklists, clawback commissions for terminated accounts, dedicated IPs, feedback loops, inbox placement testing, email content testing, list segmentation, list verification, suppression lists, gradual IP warm-up, and blacklist monitoring. Furthermore, actively managing complaints and protecting sender reputation are crucial. Compliance should be staffed with deliverability experts and sales should understand the importance of compliance.

Key opinions

  • Authentication: Implementing SPF, DKIM, and DMARC is fundamental for email authentication and preventing spoofing.
  • List Hygiene: Maintaining clean email lists through verification and suppression lists is essential for deliverability.
  • Sender Reputation: Building and protecting sender reputation is crucial; this can be achieved through dedicated IPs and a gradual IP warm-up process.
  • Monitoring and Testing: Regular monitoring of inbox placement, blacklist status, and email content is necessary for identifying and resolving deliverability issues.
  • Compliance and Sales Alignment: Aligning compliance and sales through clear policies, clawback provisions, and expert staffing ensures adherence to deliverability best practices.
  • Data Analysis: Downloading and saving ESP data to a database will allow for analysis and notifications, enabling quicker reaction times for alerts.

Key considerations

  • Prospect Vetting: Implement a vetting process for new prospects to avoid onboarding clients with poor sending practices.
  • Feedback Loops: Actively participate in feedback loops and manage complaints effectively to improve list quality and sender reputation.
  • Content Quality: Ensure email content is properly tested for spam triggers and rendering issues to optimize deliverability.
  • Segmentation Strategy: Develop a robust list segmentation strategy to send targeted and relevant emails, improving engagement and deliverability.
  • IP Warm-up: Plan a gradual IP warm-up strategy to establish a positive sending reputation with ISPs.
  • Unsubscribe Feedback: Providing an unsubscribe feedback form to improve knowledge of why users are unsubscribing.
Marketer view

Email marketer from Litmus advises that testing email content for spam triggers, rendering issues, and accessibility concerns is crucial to optimize deliverability and ensure a positive subscriber experience.

July 2022 - Litmus
Marketer view

Email marketer from MailerCheck shares that monitoring IP addresses and domains for blacklisting is crucial for maintaining deliverability. If blacklisted, immediate action is required to resolve the issue and get removed from the blacklist.

May 2021 - MailerCheck
Marketer view

Email marketer from Email Geeks recommends explaining compliance's role to sales as protecting their interests and disallowing side letters to contracts.

June 2021 - Email Geeks
Marketer view

Email marketer from Email Geeks suggests to download the data, save it to the database, and have Slack notifications when clients hit a spam % (varies by client). Then alerts when IP and domain reputation change. Also allows us to do things like overlay daily Gmail email volume with GPT.

August 2023 - Email Geeks
Marketer view

Email marketer from GlockApps shares that inbox placement testing is essential to monitor where emails land (inbox, spam folder, or missing) across different ISPs and email clients, allowing for proactive identification and resolution of deliverability issues.

May 2022 - GlockApps
Marketer view

Email marketer from Email Geeks advises custom return/bounce domain, click tracking domain, DKIM, and SPF for all accounts, and a DMARC alert upon test send or before actual send.

June 2022 - Email Geeks
Marketer view

Email marketer from Email on Acid shares that segmenting email lists based on engagement, demographics, and behavior allows ESPs to send more targeted and relevant emails, which improves engagement rates and deliverability.

September 2024 - Email on Acid
Marketer view

Email marketer from Reddit explains that using dedicated IPs allows a new ESP to build its own reputation without being affected by the sending practices of others, which is crucial for establishing good deliverability.

November 2022 - Reddit
Marketer view

Email marketer from Email Geeks recommends clawback commissions on accounts terminated within a set period and staffing compliance with deliverability experts.

July 2024 - Email Geeks
Marketer view

Email marketer from Validity suggests using list verification services to identify and remove invalid, inactive, or spam trap email addresses from subscriber lists, which helps maintain a clean list and improve deliverability.

March 2023 - Validity
Marketer view

Email marketer from SendGrid advises that gradually increasing email volume when using new IPs is crucial to establish a positive sending reputation with ISPs and avoid being flagged as spam. This involves starting with small volumes and gradually increasing over time.

March 2021 - SendGrid
Marketer view

Email marketer from Mailjet suggests implementing tools for authentication (SPF, DKIM, DMARC), feedback loops, list hygiene, and content analysis to ensure deliverability and compliance.

May 2023 - Mailjet
Marketer view

Email marketer from Email Geeks suggests including an unsubscribe page feedback form to gather valuable subscriber feedback.

December 2022 - Email Geeks
Marketer view

Email marketer from SparkPost shares that maintaining suppression lists of unsubscribed, bounced, and complained addresses ensures that these recipients are not sent further emails, which is crucial for compliance and deliverability.

June 2024 - SparkPost
Marketer view

Email marketer from Email Geeks suggests a discovery checklist for sales to vet prospects, including red flag warnings based on responses.

March 2023 - Email Geeks

What the experts say
5Expert opinions

For a new ESP, prioritizing deliverability and compliance involves a multifaceted approach. This includes implementing tools for blocklist monitoring, utilizing resources like Spamhaus, and actively managing clients based on internal metrics to identify compliance risks. Building something akin to Mailchimp's Omnivore, monitoring for targeted spamhaus listings and periodic inbox testing for infrastructure assessment is beneficial. Crucially, establishing an empowered Abuse/Compliance desk with robust developer and data analyst support, separate from customer support, is essential. Managing feedback loops, complaints, and monitoring IP addresses for blacklisting are also important. Ultimately, prioritizing building and maintaining a positive sender reputation through adherence to best practices and active monitoring is key.

Key opinions

  • Monitoring and Alerting: Continuous monitoring of IP/domain blocklists, Spamhaus listings, and sender reputation is crucial for identifying and addressing deliverability issues promptly.
  • Abuse/Compliance Desk: Having a dedicated, empowered Abuse/Compliance desk with technical support is essential for effective deliverability management.
  • Complaint Management: Implementing effective feedback loops and actively managing complaints are vital for identifying and resolving deliverability issues.
  • Sender Reputation: Building and maintaining a positive sender reputation through best practices and active monitoring is fundamental.
  • Client Management: Stack ranking clients based on internal metrics helps prioritize compliance efforts and identify potential problem areas.

Key considerations

  • Blocklist Monitoring: Implement a robust system for monitoring IP and domain blocklists to quickly identify and address potential deliverability issues.
  • Data Support for Compliance: Ensure the Abuse/Compliance desk has sufficient developer and data analyst support to effectively manage deliverability challenges.
  • Proactive Complaint Investigation: Develop a process for investigating complaints beyond simply removing the affected recipient to address underlying issues.
  • Compliance Best Practices: Adhere to industry best practices and monitor deliverability metrics to maintain a positive sender reputation.
  • Internal Metrics: Establish and track internal metrics to identify clients who may be negatively impacting deliverability.
Expert view

Expert from Word to the Wise emphasizes the importance of monitoring IP addresses for blacklisting and taking prompt action to resolve any issues to prevent deliverability problems.

June 2022 - Word to the Wise
Expert view

Expert from Word to the Wise explains that a new ESP should prioritize building and maintaining a good sender reputation by adhering to best practices, authenticating emails, and actively monitoring deliverability metrics.

November 2021 - Word to the Wise
Expert view

Expert from Email Geeks emphasizes the importance of an empowered Abuse/Compliance desk with developer and data analyst support, separate from the customer support management chain.

August 2022 - Email Geeks
Expert view

Expert from Spam Resource explains that implementing effective feedback loops and diligently managing complaints is crucial for an ESP to identify and address deliverability issues and maintain a positive sender reputation. They also mentioned that you need a process to investigate complaints, not just remove.

June 2023 - Spam Resource
Expert view

Expert from Email Geeks shares that for deliverability and compliance tools, a baby ESP should implement: Hetrix for IP/domain blocklist monitoring, internal use of Spamhaus, stack rank clients based on internal metrics, build something like Mailchimp’s Omnivore, watch for targeted spamhaus listings, and periodic inbox testing.

February 2022 - Email Geeks

What the documentation says
5Technical articles

Email authentication and deliverability rely on several key tools and protocols. SPF is a method to prevent spoofing by verifying the sender's authorization to send emails on behalf of a domain. DKIM provides a way to digitally sign emails to ensure they haven't been tampered with during transit. DMARC builds upon SPF and DKIM to allow domain owners to set policies for handling emails that fail authentication. Feedback loops (FBLs) provide information on when recipients mark emails as spam, enabling better list hygiene. Google Postmaster Tools allow senders to monitor their sending reputation and identify potential issues.

Key findings

  • SPF Prevents Spoofing: SPF helps prevent spammers from using a domain to send unauthorized emails.
  • DKIM Ensures Integrity: DKIM allows recipients to verify that an email originated from an authorized source and hasn't been altered.
  • DMARC Sets Policy: DMARC enables domain owners to define how email receivers should handle messages that fail authentication checks.
  • FBLs Improve List Hygiene: Feedback loops provide critical data for identifying and removing subscribers who mark emails as spam.
  • Postmaster Tools for Monitoring: Google Postmaster Tools provide valuable insights into sender reputation and deliverability.

Key considerations

  • Implement SPF, DKIM, DMARC: Ensure SPF, DKIM, and DMARC are correctly implemented to authenticate emails.
  • Monitor Feedback Loops: Actively monitor and respond to feedback loops to maintain a healthy email list.
  • Use Postmaster Tools: Regularly monitor Google Postmaster Tools to identify and address deliverability problems.
  • Establish Quarantine/Reject Policies: Implement the use of a DMARC policy that dictates actions for emails that fail authentication.
Technical article

Documentation from DMARC.org details that DMARC builds upon SPF and DKIM to provide a policy for handling emails that fail authentication checks, allowing domain owners to instruct receivers on how to handle such messages (e.g., reject, quarantine).

June 2021 - DMARC.org
Technical article

Documentation from DKIM explains that DomainKeys Identified Mail (DKIM) is an email authentication method that allows senders to digitally sign their emails, which helps recipients verify that the message was sent from an authorized source and has not been tampered with during transit.

March 2025 - DKIM
Technical article

Documentation from Return Path explains that feedback loops (FBLs) provide valuable data by notifying senders when recipients mark their emails as spam, enabling them to promptly remove those recipients from their lists and improve list hygiene.

February 2022 - Return Path
Technical article

Documentation from Google explains that Postmaster Tools allows senders to monitor their domain and IP reputation, spam rate, and feedback loop data, providing insights into potential deliverability issues and areas for improvement.

April 2022 - Google
Technical article

Documentation from RFC explains that Sender Policy Framework (SPF) is an email authentication method designed to prevent spammers from sending messages on behalf of your domain. This can prevent spoofing.

July 2023 - RFC