Have the same issue but I'm using inbox
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I had this exact problem. Had to create an AC account just so I can help you lol. Gmail would only pull down emails if I went into the app. This is because of "Doze". Marshmallows sleep battery save feature. To fix this (i have Nexus6) I went to settings, battery, select the three dots in upper right corner, select battery optimization, select the drop down under " not optimized" select all apps. Located gmail app and select it to be "not optimized". Emails now come in automatically and i havnt noticed any battery issues. Still get same battery usage that i did before ymmv.
Good luck!!
I've been having issues with emails pushing correctly on my Moto G 2015 ever since it got it's 6.0 update. I know this is a Nexus 5X thread but I ran into this as I was trying to find a fix. And as an FYI, I have not made any changes to my phone/Gmail settings since the 6.0 update.
I did take off gmail app in settings for batt optimization and it didn't seem to help.
I did take off gmail app in settings for batt optimization and it didn't seem to help.
Not me. I've been having problems intermittently on my LG G3 running Lollipop 5.0.1, not rooted. Most of the time I get notifications for gmail right away but sometimes they are delayed as much as 12 hours. It just happened to me again yesterday. I can see that the email was sent at 8am but the notification didnt happen come for over 12 hours.