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Seznam Email vs GMX Mail: catalog facts
Seznam Email	GMX Mail
Free Free email accounts.	Free Free, supported by advertising and sponsored content.
Web	Web
Free addresses on several Czech domains One account covers other Seznam services	Up to 10 addresses on one free account Mail collector for other email accounts
Interface and service aimed at Czech speakers Requires a mobile phone number to register	Web portal shows sponsored news and ads Hosted service, so you rely on the provider for your mail
Web application, Hosted service	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.