I had this problem on my iPhone and I am using dreamhost. I was using old language on my settings page. Please see the work around on this page
https://help.dreamhost.com/hc/en-us/articles/216385537-How-to-set-up-email-on-an-iPhone
It was changing the settings to:
Incoming
imap.dreamhost.com
pop.dreamhost.com
Outgoing
smtp.dreamhost.com
Hope this helps.
iPhone 6
Hello LYMMHMMM,
Welcome to Apple Support Communities. It looks like you're having issues with your email account on your iPhone. We'd be happy to provide some guidance.
We've noticed that your iPhone is running iOS 10.2.1. To get started, let's make sure your iPhone is up-to-date on software. Please back up your iPhone, then update as explained in the following links:
How to back up your iPhone, iPad, and iPod touch
Update your iPhone, iPad, or iPod touch
Also, please use the following link to help with your incoming, and outgoing email setting:
If the issue persists afterwards, please contact your mail account provider for further assistance.
We hope this information is useful. Kind regards.
"Cannot verify server identity" message from mail, iOS 10.2.1
