Mail users with iOS and MacOS devices cannot access mail on Plesk server: Cannot Verify Server Identity


iOS / MacOS issue: system does not allow the user to "trust" a SSL/TLS certificate after renewal


There are two possible solutions:

Solution 1. Recreate mail accounts devices

Remove mail account from iOS / MacOS device.

Re-create email account on iOS / MacOS device.

Solution 2. Manually install and allow using required SSL certificates from device settings:

Get the certificate. The certificate can be exported from the browser to a .cer file:

Upload the .cer file on iOS device through email, Safari browser or File Sharing and install it by clicking/tapping on the uploaded file.

Set up the email account.

If more information is needed on the certificate, it can be found in: Settings > General > Profile.

Note: Interfaces on different versions of iOS / MacOS may vary.

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