Email Deliverability for Nonprofits: Reaching Donors Without Getting Filtered

Best Practices

Nonprofits face unique email deliverability challenges. You often send to large lists of donors with varying engagement levels, use fundraising language that can trigger spam filters, and may lack dedicated IT resources for email authentication.

But the fundamentals are the same: authenticate your domain, maintain your list, and send content people want to receive.

Authentication First

Many nonprofits skip email authentication because they lack technical staff. This is the single biggest deliverability problem for nonprofit organizations.

What You Need

• SPF record — Authorizes your email sending services
• DKIM — Cryptographically signs your emails
• DMARC — Ties SPF and DKIM together and provides reporting

Check your domain — if any of these are missing or failing, fix them before worrying about anything else.

Common Nonprofit Setup

Most nonprofits use Google Workspace (through Google for Nonprofits) or Microsoft 365 for business email, plus a platform like Mailchimp, Constant Contact, or Bloomerang for donor communications.

Your SPF record needs to include all services:

v=spf1 include:_spf.google.com include:servers.mcsv.net ~all

Set up DKIM for each platform and publish a DMARC record.

Donor List Management

The Unique Challenge

Nonprofit lists accumulate over years of events, campaigns, and partnerships. Many contacts:

• Donated once at a gala five years ago and haven't engaged since
• Were added from a sign-up sheet at an event (questionable opt-in)
• Have changed email addresses since signing up
• Never explicitly opted into email communications

Cleaning Your Donor List

Event-Based List Building

Nonprofits often collect emails at events. Protect list quality:

• Use clear opt-in language ("Would you like to receive emails from us?")
• Verify addresses with a confirmation email after the event
• Don't assume event attendance equals email consent

Fundraising Email Best Practices

Frequency Management

Nonprofits often increase email frequency dramatically during fundraising campaigns (end-of-year giving, annual fund drives). This triggers complaints:

• Set expectations early — Tell subscribers they'll receive more emails during giving season
• Offer frequency preferences — Let subscribers choose "fewer emails" instead of unsubscribing
• Segment by giving history — Major donors may welcome frequent updates; one-time donors may not

Content That Avoids Filters

Fundraising language can trigger spam filters when combined poorly:

• Avoid ALL CAPS and excessive exclamation marks in subject lines
• Don't use "Donate now!!!" — use "Your gift makes a difference"
• Include a mix of text and images (not image-only emails)
• Link to your own domain, not shortened URLs

Year-End Giving Campaigns

The end-of-year giving season is critical for nonprofits and challenging for deliverability:

1. Clean your list before November — Don't send your biggest campaign to your dirtiest list
2. Warm up volume gradually — If you normally send weekly, don't suddenly send daily
3. Send to engaged donors first — High early engagement signals to providers that your email is wanted
4. Monitor complaint rates — Check Google Postmaster Tools daily during heavy sending periods
5. Make unsubscribe easy — Every unsubscribe is a complaint you prevented

Platform Recommendations

Whichever platform you choose, authenticate your domain through that platform before sending.