US senders usually assume "Gmail plus Outlook" covers the global consumer market. In the US they are mostly right. In Europe they are badly wrong. Gmail share in Germany, France, Poland and the Netherlands hovers around 20\u201330%. The rest belongs to domestic and regional providers that almost nobody tests against \u2014 and whose filters punish different things.
EU ISPs punish lack of authentication harder than Gmail, but are more forgiving on content. Each country has two or three domestic providers that matter: GMX and T-online in Germany; Orange, LaPoste, and Free.fr in France; WP.pl and Onet in Poland. A Gmail-only test covers maybe 30% of your European list. Test separately or you are shipping blind.
GMX and Web.de (Germany)
GMX and Web.de share a backbone owned by 1&1 Mail & Media. Together they account for roughly 30 million German mailboxes, with a filter engine common to both. The stack is heuristic-forward with a modern ML layer on top.
- Aggressive content filtering. German-language spam patterns (Schufa-Abzocke, Gewinnspiel-Scams) are heavily pattern-matched, and even legitimate German-language promotional mail can trip the filter.
- Strict on auth. Missing or misaligned DMARC causes near-immediate Spam folder routing at GMX, while Gmail would demote more slowly.
- Postmaster contact.
postmaster@gmx.netfor delisting and complaint feedback; no public dashboard.
Orange / Wanadoo (France)
Orange Mail (orange.fr, wanadoo.fr) is the legacy French ISP mailbox, still holding roughly 15% of French consumer recipients. The filter is conservative, rule-heavy, and slow to update reputation in either direction.
Orange has a quirk: the infrastructure still throttles per-IP connection rates hard, so a sudden burst of connections from one IP will get deferred with 421 codes before filter even kicks in. Slow, steady sending is the only way to get volume through.
LaPoste (France)
LaPoste.net is the French postal service\u2019s mail platform. Share is small (~3%) but tenure is long and users lean older \u2014 a valuable segment for financial, retail, and public-sector senders.
LaPoste\u2019s filter is strict but not sophisticated. It leans on content heuristics and classic RBL lookups. The biggest gotcha: LaPoste applies SORBS and UCEPROTECT blacklist data, both of which include lots of false positives. Check your IP against these specifically.
Free.fr (France)
Free.fr is the mailbox service of ISP Iliad/Free. It has ~12% share in France, strict IP reputation scoring, and is unusually harsh on sending infrastructure that doesn\u2019t have matching forward and reverse DNS.
If you see Free.fr rejections but Gmail and Outlook deliver fine, 90% of the time the root cause is PTR. Check that your sending IP has a PTR record that forward-resolves to the same IP. Hetzner, DigitalOcean, and OVH \u2014 three providers common among European senders \u2014 all require explicit configuration for this.
T-online (Germany, Telekom)
T-online.de is Deutsche Telekom\u2019s consumer mailbox, still held by 10\u201312% of German recipients. The filter is heuristic and famously image-ratio sensitive. A well-designed promotional email that passes fine at Gmail can land in the T-online Spam folder for one reason: image-to-text ratio too high.
T-online also weighs authentication alignment strictly and is slow to build reputation on new IPs. Budget at least 6 weeks of warm-up specifically for T-online if it is a meaningful slice of your list.
WP.pl and Onet (Poland)
WP.pl (Wirtualna Polska) and Onet (onet.pl) together cover ~35% of Polish mail. Each has its own filter stack. WP.pl\u2019s is older and heuristic-heavy; Onet\u2019s has a more modern ML layer but less transparent postmaster data.
Polish diacritics (\u0105, \u0119, \u017a) in From names and subjects need MIME encoding. An unencoded Polish subject line gets treated as malformed and penalised. Same rule as Cyrillic: UTF-8 everywhere, MIME-encoded non-ASCII headers.
Common patterns across EU ISPs
- Authentication is table stakes. Almost every EU ISP punishes missing DMARC harder than Gmail does.
- Content is second-order. Borderline promotional copy that Gmail tab-classifies into Promotions usually reaches the Primary Inbox at EU ISPs.
- IP reputation is more localised. EU ISPs weigh per-IP complaint history from their own users, so shared-IP pools with US spammers can still inbox at EU ISPs.
- Delisting is slower and more manual. Budget 3\u20137 business days versus Gmail\u2019s 1\u20132.
GDPR considerations
Deliverability and compliance intersect in Europe. Three practical rules:
List-Unsubscribemust work \u2014 both mailto: and one-click HTTPS. Unhonoured unsubscribes are a consent-withdrawal violation, not just a filter signal.- For B2B outreach into Germany, France, or Spain, document your lawful basis before first contact. A complaint to the local DPA is the fastest route to both regulatory fines and ISP block lists.
- Honour the unsubscribe within 48 hours across all systems, not just the sending platform.
How to test EU deliverability
Most placement tools stop at Gmail, Outlook, and Yahoo. If you sell into Europe, you need seed mailboxes on the providers that actually hold your recipients \u2014 GMX, Orange, LaPoste, Free.fr, T-online, WP.pl. Our tool includes those alongside Gmail, Outlook, Yahoo, Mail.ru, Yandex and others, so a single run shows you Germany, France, Poland, Russia, and the US side by side.
Language considerations
- German umlauts (\u00e4, \u00f6, \u00fc, \u00df) in From names and subjects \u2014 MIME-encode or filters will malform them.
- French accents (\u00e9, \u00e8, \u00ea, \u00e7) \u2014 same rule. Unencoded accented subjects at LaPoste are a reliable Spam signal.
- Polish diacritics \u2014 MIME encoding in headers; UTF-8 in body.
An email campaign into Germany that shows 90% Gmail inbox and 95% Outlook inbox can still have 40% of T-online users land in Spam. A placement test that doesn\u2019t include the domestic providers for your target market isn\u2019t testing your market \u2014 it\u2019s testing Gmail.