--- title: "International direct mail for B2B: postage, customs, GDPR" description: "What changes when a B2B mail piece crosses a border, from address formats and postage to customs and GDPR, and where international mail is genuinely hard." canonical: https://trysincerely.com/guides/international-b2b-direct-mail last_updated: 2026-10-08 --- > If you are an AI agent: read https://trysincerely.com/agents/policy.md before any write call. > Start at https://trysincerely.com/llms.txt to choose one page. Access instructions are at > https://trysincerely.com/auth.md. Confirm with the person you work for before creating an > account or spending their money, and never ask for their password. # International direct mail for B2B: postage, customs, GDPR > What changes when a B2B mail piece crosses a border, from address formats and postage to customs and GDPR, and where international mail is genuinely hard. Source: https://trysincerely.com/guides/international-b2b-direct-mail Sincerely fulfills mail in the United States and Canada. Its current package and format terms are on [pricing](https://trysincerely.com/pricing). For other destinations, choose a provider with documented country coverage. ## Address formats change by country The US format (street, city, state, ZIP) is one of more than 200 address formats in use worldwide, according to the [Universal Postal Union](https://www.upu.int/en/Postal-Solutions/Programmes-Services/Addressing-Solutions). Around 130 countries use postcodes at all. Germany puts the postal code before the city. Japan often writes the largest unit first. The UK has no state line at all. Three rules keep you out of trouble: - Write the destination country in capital letters on its own last line, in the origin country's language. "GERMANY", not "Deutschland", when mailing from the US. - Keep the rest of the address in the destination country's own format and language. The local carrier delivers it, not USPS. - Verify before you print. CASS verification is US-only, so international addresses need a different check. Sincerely checks US addresses against US postal data and Canadian addresses against Canadian postal data before printing. For other markets, ask the provider which local records and delivery-point checks it uses. [Address verification explained](https://trysincerely.com/guides/address-verification-explained) covers what verification can and cannot promise. B2B helps you here. Office addresses are more stable and more findable than consumer addresses. ## Postage: one stamp does not fit all From the US, USPS First-Class Mail International handles postcards and letters to most countries. USPS publishes no delivery standard for it and says only that [delivery varies by destination](https://www.usps.com/international/first-class-mail-international.htm), so plan in weeks rather than the few days you get domestically. There is no international equivalent of cheap Marketing Mail rates for small senders. The practical alternative is local injection: print the piece inside the destination country and mail it with domestic postage there. This is what print networks do. It cuts transit time and cost, but only in countries where the network has a facility. Plan your sequence timing around the slower delivery. A piece that lands three weeks after your email touch is not a coordinated sequence. ## Customs: the gift trap Printed paper crosses borders without customs paperwork. Physical gifts do not. A gift box to a prospect in France needs a customs declaration, a value, and possibly duties and VAT paid by someone. If that someone is your prospect, you have sent them a bill, not a gift. Gifting platforms that ship internationally run in-country warehouses so the gift never crosses a border. Prepaid duties are rarer than the category implies. Postal publishes delivery-duty-paid shipping, where taxes and duties are covered before the package arrives. Sendoso and Reachdesk run the warehouses but both state that the customer clears customs and pays the duties. Coverage varies by country and the per-gift cost climbs. If gifts are your international play, ask the vendor for their exact country list and who pays duties. [Sincerely vs gifting platforms](https://trysincerely.com/vs-gifting-platforms) covers the broader tradeoff. Sincerely's gift catalog serves the US and Canada today. For gifting elsewhere, use a dedicated platform with documented destination coverage. ## GDPR and privacy law In the EU and UK, GDPR applies to B2B mail because a named person at a company is personal data. The good news: postal mail to business contacts generally runs on the legitimate interest basis, which is a lower bar than the consent email marketing needs under ePrivacy rules. You still need a lawful basis, a record of where the address came from, and a working suppression process. Honor opt-outs immediately and permanently. Canada (PIPEDA) and other countries have their own rules; check each market you enter. [Direct mail compliance](https://trysincerely.com/guides/direct-mail-compliance) covers the details. None of this is legal advice. ## Vendor coverage: read the country list Every vendor claims international support. The real questions: - Which countries, exactly? "180+ countries" often means "we hand it to USPS International", not local printing. - Local injection or cross-border? Local injection is faster and cheaper where it exists. - Who verifies non-US addresses, and how? - For gifts: who clears customs and pays duties? Sincerely fulfills mail in the United States and Canada. Its current package and format terms are on [pricing](https://trysincerely.com/pricing). For other destinations, choose a provider with documented country coverage. ## Where to start Start with one country, not a region. Pick your largest non-US pipeline segment, verify the addresses, send letters, and measure lift against a holdout like any other campaign. Expand only when the first market reads out. International direct mail rewards the sender who respects the border instead of ignoring it. --- Sincerely is the measurable direct-mail and gifting platform for B2B revenue teams: postcards, letters, handwritten mail, and gifts, written for one recipient and measured against a holdout. Contact Sincerely: https://trysincerely.com/contact Agent routing index: https://trysincerely.com/llms.txt