Hello,

We have not seen this issue, but we would be more than happy to test this. Could you open a ticket with details and we will see what we can do in regards to troubleshooting your issue?

Make sure that the Iphones are up to date firmware wise.

We have seen issues that they wont connect until a restart and update.

Please refer to the first post before answering.  As indicated, we have completed basic and standard troubleshooting steps.

Sorry for trying to help. Will escort myself out.

Hello, 

I have been doing some testing locally on my iPhone on several different servers using the native email client and have not seen any issues. The best bet would be to open a ticket so that we can test against your server directly to see if we can replicate the issue or find any issues related to the setup. Apple prefers SSL connections over TLS connections and any type of certificate hiccup can cause issues.