The SSL for our Incoming servers (us3.imap.mailhostbox.com and us3.pop.mailhostbox.com) on Enterprise Email hosted at Austin Data Center is up for renewal.
Post completion of certificate renewal, you might face issues on your Email client, particularly iOS and MAC, stating that the certificate has expired.
In order to resolve this error, you need to re-configure the Email account for the respective Mail client to ensure that the new SSL is fetched for the IMAP/POP server.
You can refer to the following Knowledgebase article on how to resolve this issue :
https://support.mailhostbox.com/iphone-and-apple-mail-issues/