mailbox.org
Mixed
Results vary across mailbox.org: of 10 URLs tested, 4 are disrupted some of the time, 3 load normally and 3 have no conclusive recent result. 206 tests have been run under this domain since 2015-02-21, the most recent on 2026-08-23.
The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
The site itself
http://mailbox.orgIntermittenthttps://mailbox.orgNot blockedhttps://mailbox.org:80Not enough datahttp://www.mailbox.orgIntermittenthttps://www.mailbox.orgIntermittentPages and subdomains (5)
https://mailbox.org/enas of 2025Not blockedhttps://mailbox.org/en/private-customersas of 2026Not blockedhttp://mx1.mailbox.orgNot enough datahttps://imap.mailbox.orgNot enough datahttp://office.mailbox.orgas of 2026IntermittentAbout mailbox.org and the Great Firewall
Results vary across mailbox.org: of 10 URLs tested, 4 are disrupted some of the time, 3 load normally and 3 have no conclusive recent result. 206 tests have been run under this domain since 2015-02-21, the most recent on 2026-08-23.
Plain HTTP and HTTPS differ here: http://mailbox.org is intermittent, https://mailbox.org is not blocked. The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
Elsewhere on the site
Each URL's status is its verdict over the last 90 days, the same one its own page headlines.