An SSL Certificate is a file issued by a trusted third party that verifies you have connected to a legitimate server and not an imposter trying to steal your data. When an SSL connection is made with a server, the server provides the certificate to the computer connecting to it. The computer then analyzes the certificate to verify the identity of the server.

All SSL certificates eventually expire and must be reissued. When this happens, your computer or email application may not recognize the new one. In some cases, you’ll be prompted to approve the certificate manually or cancel the connection; in others, it simply won’t connect.

Each email application handles this a bit differently, so we’ll show you how to accept the new SSL in your application.

Trust the Certificate in iOS

“Cannot Verify Server Identity. The identity of “mail.example.com” cannot be verified by Mail. Review the certificate details to continue” If you’re receiving this or a similar error on your iOS device, follow these steps:

1. When you get the error message, tap Details.
   

2. Tap Trust in the top right corner.
   

3. If Steps 1 and 2 do not resolve the issue, you should update the unbranded hostnames for IMAP and SMTP. You can get the unbranded hostnames from the email hosting dashboard by clicking the “DNS Configuration” under the “Mail” tab.

4. For Example change Host Name from imap.domain.com to us2.imap.mailhostbox.com and smtp.domain.com to us2.smtp.mailhostbox.com.

5. If the Trust Button is missing or greyed out, continue to the steps below:

   Turn on SSL, change to Port 587, and verify email can be sent.

   1. Navigate to Settings, then select Accounts and Passwords.
   2. Select your email account.
   3. Select SMTP (Outgoing Mail Server).
   4. Select Primary Server.
   5. Toggle Use SSL on, and change the Server Port to 587.
   6. Press Done in the upper right corner.