What Sender Practices Matter Most for Year-End Appeals?

Pre-Warming Your Core Segments

Deliverability is shaped well before your first December appeal. We recommend starting this work in October and November to build positive engagement signals before your biggest sends hit. The goal is for inbox providers to see your domain as active and trusted.

This sequencing involves:

• Sending to your most engaged contacts first (consistent openers and clickers)
• Gradually increasing volume over time to re-establish engagement patterns
• Maintaining a steady rhythm rather than long gaps followed by massive blasts

By the time December arrives, your domain has a strong, recent engagement history. Your audience is warmed up, and your larger sends are far less likely to be filtered or throttled by major inbox providers.

Suppressing Non-Engagers to Protect Your List

List quality matters more than list size at year-end. Longtime non-engagers dilute your engagement signals, making your sends look less relevant to providers like Gmail and Outlook. This can cause your emails to be sent to spam—even for your most active supporters.

Suppressing inactive contacts concentrates your sends on the audience most likely to engage. Year-end is not the moment for "win-back" campaigns for cold contacts. Higher send frequency combined with low engagement increases the risk of spam complaints, which can damage your entire domain's reputation.

While it feels like reducing reach, in practice, a smaller, engaged list will always outperform a larger, inactive one.

Leading with Stewardship Before the Ask

One of the biggest mistakes we see is going straight into high-frequency asks without first re-engaging the audience. Inbox providers watch how recipients interact with your initial touchpoints before deciding how to treat your larger December appeals.

Stewardship emails rebuild engagement intentionally through:

• Impact updates showing what your organization accomplished this year
• Stories from the field that make your mission tangible
• Program highlights that reconnect supporters to your core purpose

These emails are not just "nice to have." They give recipients a reason to interact before being asked for money, strengthening your sender reputation heading into peak volume. When supporters feel connected, your eventual ask follows a clear narrative of impact.

Testing Early, Not During Peak Moments

Content testing is vital, but don't wait until Giving Tuesday to experiment. We recommend starting your A/B testing in September and October to remove uncertainty before volume ramps up.

Early testing allows you to:

• Identify which subject lines and messaging styles drive the most opens
• Understand how different segments respond to tone and urgency
• Spot fatigue risks before you increase your send frequency in December

By the time your main appeals go out, you are not guessing under pressure. You are executing a plan validated by real performance data, keeping your year-end sends stable and predictable.

What This Looks Like in Practice

When these practices are in place, year-end campaigns run with a lot less friction. Emails reach the inbox consistently, engagement holds steady, and your team isn't scrambling to diagnose deliverability issues in the middle of a critical fundraising window.

The difference shows up in performance stability: open and click rates stay high even as volume increases, and conversions improve because your audience is already primed. Instead of reacting to problems, your team executes against a tested plan, leaving you with a healthier, more engaged list heading into the new year.

Learn More About Year-End Strategy