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

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