Since more than 2 years this feature missing

This feature would be awesome! I have several POP and iMap emails. I need to stagger them, some of the POPs I want to be able to set to only a few times a day.

Also, when I'm doing outdoor activities, such as camping, need to temporarily set all to 'manual only' so it does not suck my battery dry (camp spots have barely one bar and no internet service but the phone keeps on trying to connect). I think I can do this with background refresh but have not tried it yet.

From FAQ:
How often does Airmail check my email accounts for new mail?
By default, Airmail checks the inbox continuously (via push sync) for new messages every minute. It checks your folders every 10 minutes. But you can change these settings in Preferences.

Where is this option in Airmail for iPhone?

Yes this would be a good basic feature, my use case is 5 imap accounts without push capabilities. Would be good to be able to set different poll frequencies.

This would be great for spam filters, so they can clean the server before Airmail sees the spam and notifies about it.

Yes please! I had expected it to be a feature already. my battery gets hammered with push rather than fetch.

Yes please for my battery

+1 on this!

Yes please more transparency. I disabled push notifications but messages arrive instantly. Is it pulling very often? Push enables anyway?

Why not sync the setting from Airmail for Mac? Airmail for iOS uses a lot of traffic on my device, i.e. 60 MB per hour. Setting a custom interval would be a benefit.

Please please allow us to customise sync intervals

Yes, please, an option to choose minute: 1,2,3 ... 10 ... 15 ... etc.

I agree with your that this should be a nice feature to have.

That would indeed be a great option to have. I'm wondering how many times it now checks this.