Postcards vs Letters vs EDDM: Direct Mail Format Comparison for Canadian Businesses

Updated February 2026 — Niagara Stands Out, Niagara Region, Ontario

You’ve decided to invest in direct mail. Smart move — it’s still one of the highest-converting marketing channels for Canadian businesses. But which format should you use? Postcards, letters in envelopes, self-mailers, EDDM (Neighbourhood Mail), or oversized postcards? Each has different costs, response rates, and ideal use cases. This guide breaks down every option so you can maximize your return.

Format Comparison at a Glance

Standard Postcards: The Workhorse

The 4″×6″ postcard is the most common direct mail format in Canada. It’s affordable, fast to produce, and both sides are immediately visible — the recipient doesn’t need to open anything.

Strengths:

• Instant visibility — message seen without any action from the recipient
• Both sides usable — image on front, offer + CTA on back
• Lowest postage tier for addressed mail
• Quick production — same-day turnaround available

Weaknesses:

• Limited space for detailed information
• Can feel “mass market” for high-end services
• Easily overlooked in a stack of postcards from competitors

Best Industries:

HVAC, plumbing, roofing, landscaping, auto shops, restaurants (seasonal specials), fitness centres (new year promotions).

Oversized Postcards: The Response Rate Champion

At 6″×11″, oversized postcards dominate the mailbox. They physically stick out above standard mail, creating an instant “billboard effect.” The 5.1% response rate is the highest of any direct mail format.

Strengths:

• Highest response rate of any direct mail format (5.1%)
• Billboard effect — impossible to miss in the mailbox
• More design space — room for images, testimonials, and detailed offers
• Premium feel without envelope cost

Weaknesses:

• Higher print cost per piece ($0.50–$0.90)
• Higher postage (oversize mail rate)
• Requires strong design to use the space effectively

Letters in Envelopes: The Personal Touch

A letter in an envelope feels important. It mimics personal correspondence, which is why open rates for well-designed envelope mail run 70–90%. The downside? Higher cost and the risk of being thrown away unopened if it looks like junk mail.

Strengths:

• Perceived importance — looks personal, not mass-produced
• More space for complex offers, terms, and multi-page inserts
• Enclosure options — include a business card, magnet, or coupon
• Ideal for B2B — decision-makers open professional-looking envelopes

Weaknesses:

• Highest cost per piece ($0.75–$1.50)
• Requires the recipient to open the envelope — 10–30% never do
• Slower production (printing + folding + inserting + sealing)

Best Industries:

Dental clinics (new patient welcome letters), financial advisors, insurance brokers, real estate agents (market reports), property managers, B2B service companies.

Self-Mailers: The Middle Ground

A self-mailer is a single sheet folded and sealed with a tab — no envelope needed. It offers more space than a postcard (inside panels) at a lower cost than a letter. The 3.9% response rate sits between postcards and letters.

Strengths:

• More space than a postcard (4–6 panels when unfolded)
• Lower cost than letters (no envelope, no inserting)
• Curiosity factor — recipients unfold to see the full message

Weaknesses:

• Tabbed closure can feel “mass mailer” to some
• Design is more complex (must work folded AND unfolded)
• Heavier than postcards — higher postage tier

EDDM / Canada Post Neighbourhood Mail: The Budget Champion

EDDM (Every Door Direct Mail) — called Neighbourhood Mail by Canada Post — delivers to every address on a postal route without requiring a mailing list. At $0.18–$0.25 per piece, it’s the most affordable way to reach a community.

Canada Post Neighbourhood Mail Specifics:

• No mailing list required — covers every door on selected routes
• Minimum 500 pieces per route
• Size: Up to 380mm × 270mm (approx. 15″×10.6″)
• Weight: Up to 100g
• Processing time: 7–14 business days

Strengths:

• Lowest cost per piece of any direct mail format
• No address list to buy — huge savings for new businesses
• Saturates an area — every single household sees your message

Weaknesses:

• No targeting beyond postal route selection
• Slower delivery (7–14 business days)
• Higher minimum quantity (500+)
• Everyone on the route gets it — including non-ideal customers

Detailed Cost Comparison: 1,000 Pieces in Ontario

When to Use Each Format

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Frequently Asked Questions

What direct mail format has the highest response rate?

Oversized postcards (6″×11″) have the highest response rate at 5.1%, followed by standard postcards at 4.25%. Letters in envelopes average 3.7%, and EDDM/Neighbourhood Mail averages 3.5%.

How much does Canada Post Neighbourhood Mail cost?

Canada Post Neighbourhood Mail starts at $0.178 per piece for unaddressed mail. The minimum is 500 pieces per postal route. Total campaign costs for 1,000 pieces typically run $350–$450 including printing.

Do I need a mailing list for direct mail in Canada?

Not for Neighbourhood Mail (EDDM) — it delivers to every door on selected postal routes. For Personalized Mail (addressed postcards/letters), you need a mailing list. We can provide targeted lists based on postal code, demographics, and home ownership.

What size postcard works best for direct mail?

The 6″×11″ oversized postcard consistently outperforms all other sizes. It has the highest response rate (5.1%) and creates a “billboard effect” in the mailbox. Standard 4″×6″ postcards are the most affordable option with a strong 4.25% response rate.

How long does it take to run a direct mail campaign in Ontario?

From design approval to mailbox delivery: Personalized Mail takes 7–12 business days. Neighbourhood Mail takes 10–18 business days. We recommend starting your campaign 3 weeks before your target date to account for Canada Post processing.

Can I track direct mail response rates?

Yes. Use unique promo codes, dedicated phone numbers, or landing page URLs on each campaign. Canada Post also offers Smartmail tracking for delivery confirmation on Personalized Mail. We include tracking recommendations with every campaign.

Is direct mail still effective in 2026?

Absolutely. Direct mail response rates (3.5–5.1%) far exceed email marketing (0.5–1.5%) and digital display ads (0.1–0.3%). Physical mail creates a tactile connection that digital channels cannot replicate, and mailbox competition has actually decreased as more businesses shift to digital-only.

What should I include on my direct mail piece?

The five essential elements: (1) A compelling headline with a clear benefit, (2) A strong offer or discount, (3) Social proof (reviews, testimonials, years in business), (4) A clear call to action with phone number AND website, (5) A deadline to create urgency. For Ontario businesses, include your service area cities for local trust.