You've got your postcards. You've got your addresses. You sit down, write your first card — and you feel like you're actually doing something.
That feeling is real. Handwritten voter postcards have been shown to increase turnout by as much as 1 percent, matching or outperforming door-to-door canvassing in some studies. In a race decided by a few thousand votes, that's not a rounding error. That's the margin.
But postcards only work when they actually work — when they arrive, get read, and move someone to show up. A surprising number of volunteer postcards never make it there, or make it there and get tossed. Most of the reasons why are completely avoidable.
Here are the most common mistakes to avoid before you write your next card.
Mistake #1: Writing so small (or so messily) that voters can't read it
Handwriting is the whole point. A postcard feels personal precisely because a real person wrote it — not a printer, not a campaign algorithm. But that personal touch only lands if the recipient can actually read what you wrote.
Cramped, tiny, or rushed handwriting is one of the most common volunteer errors. If a voter has to squint or give up on the second line, the card has failed regardless of how powerful the message was.
The fix: Print rather than cursive if your cursive is hard to read. Write larger than feels natural — you have more space than you think on a quality 4x6 card. If you're writing a batch, slow down. Ten legible postcards outperform thirty illegible ones.
If you're genuinely unsure about your handwriting, ask a friend to read one back to you cold before you commit to a full batch.
Mistake #2: Going off script
Campaign scripts aren't just suggestions. They're crafted carefully — often by political scientists, legal teams, and messaging experts — to hit the right notes for a specific voter pool in a specific race.
Volunteers sometimes rewrite scripts because a message feels too blunt, too brief, or impersonal. The instinct is understandable. But the improvised version is almost never more effective, and it can create real problems: off-message claims, language that violates campaign guidelines, or — in some cases — messaging that runs afoul of election law.
The fix: Follow the script. If the campaign says to write three sentences, write three sentences. You can add warmth through your greeting or sign-off — that's your personal contribution. The core message is not the place for creative interpretation. Not sure what a good script looks like? Our 10 proven postcard message templates → give you ready-to-use starting points for every voter type.
Mistake #3: Mailing too early (or too late)
Timing is one of the most underestimated variables in postcard effectiveness. Studies show that voter outreach is most effective when it arrives "just in time" — close enough to election day that the message is top of mind, but not so close that it arrives after voting has already started or ended.
Mailing six weeks before an election means your postcard may be long forgotten — or in the recycling — by the time polls open. Mailing the week of the election risks arrival after early voting has closed or, in the worst case, after election day itself.
The fix: Follow the mailing window your campaign specifies. Most campaigns provide target mail dates for a reason. A common best practice is to mail during the two to three weeks before election day — early enough to reliably arrive, close enough to stay relevant. When in doubt, the campaign's instructions are the authority.
Mistake #4: Leaving too little space under the address
This one is purely mechanical — and it costs postcards their deliverability.
The USPS needs roughly one inch of clear space below the address block to affix or print a barcode. When volunteers write the address too low on the card, it covers that space. The post office can't process the card correctly, and it may be delayed, returned, or lost entirely.
The fix: Write the address in the upper portion of the address side, leaving a clear inch of space at the bottom. Voter Mailbag's 4x6 postcards are designed with a lined address area that guides you — use it. And skip the decorative stickers near the address: they can jam postal scanners.
Mistake #5: Including wrong or outdated election information
This mistake is the most consequential one on this list.
Including incorrect voting information — wrong dates, inaccurate polling hours, wrong registration deadlines — doesn't just fail to help a voter. It can actively suppress turnout by sending people to vote on the wrong day, or convincing them they missed their window when they haven't.
Voter information varies by state, county, and election cycle. What was true in 2022 may not be true in 2026. What's true in Georgia may not be true in Michigan.
The fix: Never include specific voting dates, hours, or procedural instructions unless they come directly from your campaign's current-cycle materials. The safest approach: focus on encouragement and civic motivation — "your vote matters," "every election counts" — and leave logistics to official sources. If your script includes specific election information, verify it against your state's official election website before writing.
Mistake #6: Sharing voter information on social media
Volunteer postcard campaigns come with address lists — real voters, real names, real home addresses. That information is provided for one purpose: writing postcards.
Photographing a completed postcard with the voter's name and address visible and posting it online — even with good intentions, like showing your progress — is a privacy violation. It exposes personal information the voter never consented to make public.
The fix: If you want to share your postcarding progress, photograph blank cards, a stack of sealed cards, or your writing setup. Never photograph a completed card with a voter's name or address visible. Shred or securely dispose of address lists when your batch is complete.
Mistake #7: Using the wrong postage
Standard first-class postage for a letter is not the same as postage for a postcard. USPS postcard postage is lower — but only for cards that meet specific size requirements. Cards that are too large technically qualify as letters and require full letter postage.
A postcard mailed with insufficient postage may be returned to you, delivered with postage due (which voters are unlikely to pay), or simply not delivered at all.
The fix: Voter Mailbag's 4x6 postcards are sized to qualify for USPS postcard postage rates. Check the current USPS postcard rate before your next mailing — rates do change. When in doubt, your campaign coordinator can confirm the correct postage for your cards.
Mistake #8: Treating it like a form letter
The research is clear on why handwritten postcards outperform direct mail: they feel personal. A voter who receives a postcard can tell, at a glance, that a real person took real time to write to them specifically.
That signal disappears the moment a postcard feels mass-produced. Identical greetings, identical closing lines, mechanical handwriting — these erode the very quality that makes postcards effective.
The fix: You don't need to write something completely unique every time. But small variations matter. Use the voter's first name. Sign with your actual name. If the campaign allows a brief personal line, add one. The goal is for the recipient to feel that a neighbor — not a campaign machine — reached out to them. For specific techniques — varying your opening line, using color, signing with your location — see: How to Personalize Voter Postcard Templates →
One More Thing: Card Quality Matters More Than You Think
Even a perfectly written postcard fails if it doesn't survive the mail. Thin cardstock smears, warps, and arrives at doorsteps looking like it's been through a washing machine. Postcard campaigns spend enormous energy on what's written — the physical card carrying those words deserves the same attention.
Voter Mailbag's 4x6 postcards are printed on durable premium cardstock that holds ink without smearing, survives postal processing, and arrives looking sharp. Every order ships free. Bulk pricing is available for postcard parties and large campaigns.
Shop Voter Mailbag Postcards →
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Voter Mailbag is a Minnesota-based, LGBTQ-owned small business dedicated to civic participation and grassroots democracy. Every purchase supports the volunteers making democracy work — one mailbox at a time.