Question: E-mails on a shared account deleting off both devices
Yesterday I noticed that my e-mail account was not functioning on my iPhone. It was not receiving incoming e-mails. The account (Comcast) was working fine though on a PC and other devices. I deleted the e-mail account on my iPhone and reinstalled and it then seemed to work fine. My wife and I share this Comcast account and she has it on her iPhone as well.
We noticed this morning that when I delete an e-mail on my iPhone, it now gets deleted off her phone as well. This did not used to be the case. I could send a message to the trash bin on my phone, but it would still show as unread on her phone when she checked e-mail later in the day. We'd like to have that set-up again but I can't find how to do so. I've looked in settings and I'm at a loss.
If anyone has a work around or an idea on what I've done to change our previous setup I'd appreciate the help.
iPhone 6, iOS 11.2