Swisssign / seppmail.cloud: Shorter domain validation period

Swisssign reduces the period for the domain validation from 365 to 198 days as of March 8th 2026 (and further reduction is planned for March 2027).

As a consequence, all previously validated domains where the validation period is more than 198 days ago would become non-validated on March 8th, and thus no new certificates could be issued.

To avoid the sudden change, re-validation for domains of customers in seppmail.cloud which have been last (re-) validated more than 180 days ago have been started early. This gives partners and customers some more time to set the new random values in DNS.

Please note that (another change) the random values MUST remain in DNS, since the existence of these records will be checked regularly by Swisssign.

Also please note that this change was not mandated by Swisssign, but by the CA/Browser forum which sets the rules for all Certificate Authorities.