Need to know, how big the filesizes are (like in Thunderbird)

I use Exchange account and folders.
I see my badge count is equals of inbox folder, but not for all folders.

Click an icon or right click > Insert Table -- Display a grid
User drags mouse across the grid to pick no of rows and columns
Table is created. See attached screenshot.
Allow adding, deleting and resizing rows and columns of the table.

Please add option to add delegates mailboxes for Exchange accounts.

(Perfect would be exchange categories sync within delegates mailbox. This is a feature that outlook for mac is missing at the moment.)

Integration with Salesforce to associate emails with leads, accounts, contacts and opportunities

Please allow the capability to move the actual message pane underneath the list of emails headers. This would facilitate a better UX for those of us that are laptops. Right now, there isnt really enough room to see both header AND message on the same page linearly.

Adding custom Tags to emails and being able to filter them and create custom filters for tags

Have the capability in preferences to change the font size for composing email, folders, incoming messages etc.

When someone sends me an embedded image. There's no way to download it or open it from within the program. There should be a right click or button to download all. Instead, I have to copy the image, paste it into Photoshop, and then save it from there with a made-up name (as no name is displayed within Airmail).

This seems like a no-brainer, or am I the one with no brain?

When I receive an email in another language in Gmail it shows at the top a button "Translate this message" to translate it with one click. This would be a great addition for Airmail.

Please add authentication for Office365 using Microsofts ADAL SDK (https://github.com/AzureAD/azure-activedirectory-library-for-objc. This would enable AirMail usage for accounts managed by draconian IT departments that don't allow app passwords while having MFA enabled. Thanks!

Currently the Starred section is mapped to Starred on Gmail mailboxes - or - shows mails manually Starred within Airmail

I don't use Gmail, I use a Premium provider and would like to have a function to support 'Flags' or using the 'Starred' section such that it automatically updates within Airmail and allows you so search/sort/filter on them

Currently, mails Flagged in iPhone do show as Starred in Airmail but do not show automatically in the Starred section.

See support thread https://airmail.tenderapp.com/help/discussions/airmail-beta-226/31-issue-with-refresh-on-starred-items

Please add support for calendar.vcs attachments!!
Currently Airmail does not show any information related to the calendar.vcs invitations - all you get is an attachment, and if you double click on it it will open in iCal - BUT iCal will not actually go to the day of the meeting! So when opening a calendar.vcs I have NO IDEA what the details of the invitation are.

Please include the details of the invitation in text within the email. Gmail does this and its brilliant.

Add the ability to block email tracking pixels, similar to PixelBlock Chrome extension for Gmail.

Easy use with PGP
I want to use the PGP tool to entcrypt my mails. But in the actual version no chance.

I have a very hard time finding attachments. They are placed randomly in my emails. For example, a recent reply from a third person says "please find these attachments". They are placed randomly "near" the bottom in a completely random place. In apple mail i can click the paperclip icon to see and download the attachments. In Airmail I have to hunt through the email to find where they randomly are. I have to open apple mail to download attachments instead of this frustrating attachment hunt. What is going on?