Problems getting e- mail messages

[AC Question]

Checked my email account on my Mac and had new messages- but these did not show up on my phone. Tried making sure all my sync settings were good.Some were off so I turned them back on.Still not working.This has happened twice since I updated to Android 5. Happened once already- cannot remember how I fixed it.

 

[Crashdamage]

Need more information to help.
1. What is your phone/
2. What email app; are you using?
3. What is the email. account? Gmail, Yahoo, private domain or ???
4. What error messages are you seeing, if any?
%. Are you having any problems with connecting to the internet?