OX App Suite have announced that support for Transport Layer Security (TLS) v1.0 and v1.1 for IMAP, POP3 and Submission will be discontinued on April 28th, 2022.
TLS protocol versions v1.0 and v1.1 contain design flaws could render them insecure for daily use. Major software and service vendors like Microsoft, Google, Apple and the Mozilla Foundation are in the process or have already disabled those protocols in their client and server products.
OX do not expect the change to have a big impact, however end-users using outdated native email clients which don't support newer TLS protocol versions will be unable to receive or send mails from their client application after this date.
A non-exhaustive list of mail clients which don’t support TLS v1.2 or later:
Access via webmail will continue working normally.
Affected end-users need to switch to another mail client solution supporting modern security standards.
