On 31/03/2026 09:33, Bill Scheding via dovecot wrote:
They install OK, dovecot starts; but iPhone and mac cannot connect to pop3
Cannot get my iPhone or Mac to accept new certs from lets encrypt, et. al.
This is a new problem, started recently.
My existing cert expired in 2016
Hi William.
Over the years Apple (and other companies) have implemented more restrictive constraints on certificates in the name of security.
A good starting point for creating certificates that Apple devices will accept is: https://support.apple.com/en-us/103769
If you are using certificates issued by your own CA, you'll also need to (a) import the CA cert into your devices, and (b) enable them in Certificate Trust Settings, before the device will accept the cert. (You shouldn't need to do anything special for certificates issued by Let's Encrypt.)
Hope that helps.
Nick.