If you need a mobile app, Thunderbird's app is being built on the K-9 mobile email app. You could use that for now.

Thanks David, but I have an ios, it appears that K-9 is for Google Play (android)

Well, this isn't a good forum for pursuing mobile apps. I use Bluemail myself (android), but there may be an ios version. The appleplay store should be a good source for email apps.

ok thanks, ill wait for others to respond to solve my issue, but this isnt really an app question anyway. Thanks for your help so far

Yes it is an app question! You are asking how to read an app (thunderbird) installed on some device you own, which stores nothing in the cloud, using another app on IOS.

What you should be asking is about an app to read your email accounts, the same as Thunderbird does and as you have already established there is no Thunderbird for IOS.