Error with IMAP mail app after adding domain

I made some changes to my DNS settings so my website (www.sitebuilder.com.ng) would point to Bubble. I also updated the settings so that my emails still point to my host so I can keep receiving and sending mail through my host. Right now it works. When I log into webmail I am able to send and receive messages.

However this has stopped the mail app on my phone from working. I am still able to receive mails when I log into the web app but the configuration for the app on my phone returns an error.

What settings should I be using for the mail app.

Here’s the changes I made so far:

www.sitebuilder.com.ng —> A record points to bubble IP
sitebuilder.com.ng —> A record points to bubble IP
mail.sitebuilder.com.ng —> A record points to hosts IP
webmail.sitebuilder.com.ng —> A record points to hosts IP (webmail log in here)