The SSL for our Outgoing server (us3.smtp.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 reconfigure the Email account for the respective Mail client to ensure that the new SSL is fetched for the SMTP server.
You can refer to the following Knowledgebase article on how to reconfigure the Email account on the respective Email client.
Mobile: https://support.mailhostbox.com/configure-your-email-address-on-your-mobile-device/
MAC/PC: https://support.mailhostbox.com/configure-your-desktop-email-clients-to-send-and-receive-email