5 Deliverability First Steps: A Strategic Checklist Before Adopting New Email Tools in 2026

Preparing for 2026: The Deliverability Foundation

Email infrastructure evolves constantly. New platforms and sending tools emerge regularly, promising enhanced features and improved efficiency. As we approach 2026, many organizations will evaluate adopting new email service providers (ESPs) or in-house sending solutions.

However, new tools alone do not guarantee deliverability success. A strong deliverability foundation must exist before any tool adoption. Neglecting this foundational work leads to wasted investment and degraded email performance. This checklist outlines five essential steps to ensure your email program is ready.

5 Deliverability First Steps

Before committing to new email infrastructure, complete these foundational checks. They establish the baseline for successful email delivery and maximize the return on any new technology investment.

1. Audit Current Authentication Records (SPF, DKIM, DMARC)

Sender authentication is non-negotiable for inbox placement. Mailbox providers rely on these records to verify sender identity and combat spoofing. Verify your current setup is accurate and correctly implemented.

• SPF (Sender Policy Framework): This DNS TXT record specifies which mail servers are authorized to send email for your domain. Incorrect SPF records lead to hard failures or soft fails, impacting deliverability. (RFC 7208).
  • Example: yourdomain.com TXT "v=spf1 include:_spf.mailprovider.com include:another.spf.com ~all"
  • Check your domain's SPF record for syntax errors or missing includes. You can use our SPF checker to validate your current configuration.
• DKIM (DomainKeys Identified Mail): DKIM adds a digital signature to your outgoing emails. This signature verifies that the email has not been altered in transit and originates from an authorized sender. (RFC 6376).
  • Example: selector1._domainkey.yourdomain.com TXT "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA..."
  • Ensure your DKIM selectors are published and correctly configured by your current sending platform.
• DMARC (Domain-based Message Authentication, Reporting, & Conformance): DMARC builds upon SPF and DKIM. It instructs receiving mail servers on how to handle emails that fail authentication checks. It also provides reporting on authentication results. (RFC 7489).
  • Example: _dmarc.yourdomain.com TXT "v=DMARC1; p=quarantine; rua=mailto:[e-mail]; fo=1"
  • Start with a p=none policy to gather data, then move to p=quarantine or p=reject as confidence grows.

2. Assess Sender Reputation

Your sender reputation dictates your inbox placement. Mailbox providers assign reputation scores to your sending IP addresses and domains. A poor reputation results in emails landing in spam folders or being rejected outright.

• IP Reputation: This score relates to the specific IP addresses used for sending. Shared IPs carry a collective reputation; dedicated IPs reflect only your sending practices.
• Domain Reputation: This score is tied to your sending domain. It is influenced by factors like bounce rates, spam complaint rates, unsubscribe rates, and engagement metrics.
• Factors Impacting Reputation: High bounce rates, frequent spam complaints, sending to spam traps, and low engagement signal poor sending practices. These actions degrade reputation quickly.
• Monitoring: Regularly check domain reputation using tools like Google Postmaster Tools, Microsoft SNDS, and various third-party reputation services. Understand your current standing before migrating.

3. Clean and Segment Your Email Lists

A clean, engaged email list is fundamental to deliverability. Sending to invalid or uninterested recipients harms your reputation and wastes resources. Prioritize list hygiene before any migration.

• Remove Invalid Addresses: Email addresses that hard bounce indicate invalid recipients. Sending to these repeatedly signals a poorly managed list.
  • Employ an email verifier to identify and remove invalid addresses proactively. This reduces bounce rates significantly.
• Deduplicate Lists: Duplicate entries inflate list sizes and lead to redundant sends. This wastes sending volume and can irritate recipients.
  • Use a list deduplication tool to streamline your lists.
• Identify Inactive Subscribers: Subscribers who have not engaged with your emails (opens, clicks) over an extended period (e.g., 6-12 months) are likely disengaged. Continuing to send to them lowers engagement rates and can trigger spam filters.
  • Implement re-engagement campaigns or remove these subscribers.
• Segment Your Audience: Group subscribers based on demographics, purchase history, or engagement levels. Sending targeted content improves relevance and engagement, which positively impacts deliverability.

4. Review Sending Infrastructure and Configuration

Even with new tools, understanding your underlying sending infrastructure is important. This includes your current SMTP configuration and DNS records beyond authentication.

• SMTP Configuration: Examine your current SMTP server settings. Confirm correct port usage, authentication methods, and connection security (TLS/SSL).
  • Use an SMTP test to verify connectivity and configuration. This ensures your server is correctly configured to send mail.
• Dedicated vs. Shared IPs: Understand if you currently send from dedicated IP addresses or shared pools. Dedicated IPs offer more control over reputation but require consistent volume. Shared IPs distribute reputation risk but offer less control.
• Reverse DNS (PTR Records): Ensure your sending IP addresses have correct PTR records. These records map an IP address back to a domain name, providing another layer of verification for receiving mail servers.
  • Example: 1.2.3.4.in-addr.arpa PTR mail.yourdomain.com
  • Missing or incorrect PTR records can cause deliverability issues.

5. Establish Clear Feedback Loops and Monitoring

Proactive monitoring and engagement with feedback loops are essential for maintaining deliverability. These systems provide direct insights into how mailbox providers perceive your email.

• Mailbox Provider Feedback Loops (FBLs): Sign up for FBLs offered by major mailbox providers (e.g., Gmail Postmaster Tools, Microsoft SNDS). These services report on spam complaints and other critical metrics.
• Performance Metrics: Continuously monitor key email metrics:
  • Bounce Rate: Keep this below 2%. High bounce rates indicate list quality issues.
  • Complaint Rate: Aim for below 0.1%. High complaint rates severely damage reputation.
  • Open Rate: Indicates recipient interest and content relevance.
  • Click-Through Rate (CTR): Shows engagement with your email content.
• Alerting: Set up alerts for sudden drops in deliverability or spikes in complaint rates. Rapid response to issues prevents long-term damage.

Why These Steps Matter Before Tool Adoption

Adopting new email tools without addressing these foundational elements is a common mistake. New platforms offer capabilities, but they do not fix underlying deliverability problems. Instead, they often amplify them.

A new ESP or sending system will inherit your existing sender reputation and list quality. Migrating a poor reputation or a dirty list guarantees immediate deliverability challenges with the new tool. This negates any potential benefits of the new technology. Completing these steps ensures a clean slate and a strong starting position. It maximizes the effectiveness of your new investment and prevents costly deliverability setbacks.

Preparing for a Successful 2026

The email ecosystem demands constant vigilance and adherence to best practices. Before you evaluate new email tools for 2026, establish a solid deliverability foundation. Audit your authentication, assess your reputation, clean your lists, review infrastructure, and set up robust monitoring. This proactive approach ensures your email program operates at peak performance, regardless of the tools you employ. Prioritize these steps to secure your email future.