The iOS phone Mail app works great with pretty much any type of account and for Android obviously if you have Gmail use their app and Microsoft accts use Outlook app. For other Android use I also like Blue mail or Aquamail.
But would rather ultimately use eM Client app when developed for Android and iOS.
I think, for Android and iOS is the best app Nine by 9Folders. Expecialy for EAS accounts. It synchronizes mail (supports push), calendar, contacts. IMAP works fine.
My preferred Android app for email is FairEmail, open source and packed with features. My calendar app is aCalendar+ (for synchronised CalDAV calendars across devices, using DAVx5). No advertisement here, the ratings in Google Play are sufficient.
I think, mobile client should support Exchange ActiveSync protocol. FairEmail lacks it. Nine supports it. There is realy good client Samsung Email for Samsung mobile owners, which supports EAS too.
@Michal_Burger, can you confirm if an Android/iOS version is still in development? I just want to make sure the project wasn’t scrapped while I’m still holding out hope for it. 
Yes I also hope the eM Client Mob app is still going to be developed and will put my hand-up to Beta test that if it’s still in the pipeline
Yeah, I can confirm that, it is closer than ever. It is now our highest priority. We’ll come up with a preview/alpha/beta in couple of weeks, so stay tuned :-).
When do ypu expect a client for the android platform?
Thanks
Is the approximate date of publication of the mobile version of eM Client already known? Our company with 20 licenses is looking forward to got it available. We consider it as a kind of milestone in the use of eM Client.
@Michal_Burger, I just want to let you know that if you’re close to a preview/alpha/beta and need/want someone to test it out that I am happy to throw my hat in the ring. I promise I’m not trying to hound you or harp on this. I’m just really excited for the mobile app.
I would love to try out the mobile app soon as well. I recently started using Spark mail, which is really good so far on mobile, but was bummed to hear that their windows version isn’t released yet. Another thing that they’re missing are labels, which are crucial to sorting emails effectively to not get them lost in the shuffle.
Also from my side @Michal_Burger: I would love to help you test some nightly versions of the mobile app 
@Michal_Burger I’m in for the beta. Its been over 3 months since this post. Is the preview/alpha/beta out yet for android?
It takes a bit more time than we expected, but the preview version is now really just a few weeks away.
I’m looking forward to it!
Any further update on a preview version of the mobile client?
We are now at 5 weeks since your post “the preview version is now really just a few weeks away”. Is there any update on the preview/alpha/beta for android?
Looking forward to this… I would like to be a part of beta team as well (if there is such a thing)… Cheers…!!
Does this look likely before year end or is next year more likely?
It’s been quite a while since the android beta was just a few weeks away. @Michal_Burger Can you give us an updated timeline for the android beta?