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I love how Gmail and other web applications allow you to click an attachment to preview WITHOUT downloading the document. This is particularly useful for Microsoft documents, since the Microsoft applications take forever to open.

Ability to add due dates for tasks would be great

It would be great to be able to drag and drop emails in a kanban view like cards in trello to create a mix between to-do and emails

Ability to add custom fields to any conversation and/or task. This could be of different formats, similiar to the capability in e.g. Notion, ClickUp, Asana etc. So you could add a due date, a start date, priority a text description field etc. or whatever else you wanted. You could have this all configurable via the sidebar (e.g. where the Contacts info is), but also with ability to show certain fields on main conversation view so you can see at a glance important fields like due date. If you could filter by fields (e.g. due date = today) this would be super helpful. If you could also sort by fields, e.g. due date, priority, this would be great. And also ability to sort by custom drag and drop (like in Notion kanban view), or standard (date order).

Snooze to a specific time works great Mon-Thu. If the desired time is after now, it sets it to today, otherwise automatically sets it to the next day. However this doesn't work so well on a Friday. When snooze to a specific time (earlier than now) is selected on a Friday, it sets it to Saturday. There should be a setting to calculate this 'tomorrow'. The tomorrow should be the next business day, not just the next calendar day (perhaps this can be toggled so people who want it to be Saturday don't lose that option). Also ideally (or optionally) it should keep track of national holidays.

In Front you could add the meeting link directly into the calendar invite

Hi, Right now we can download and attach previous emails to a new email (a common approach to refer to old emails) but clicking a email attached to another email just downloads it. Unlike in outlooks WebApp where you can view this as an email is a Lightbox viewer. My request is to have support for this

Please allow to search within specific conversation window. Right now, we can only search emails but what if we want to search within specific conversation window (created using the two comments icon on top left corner - left to pencil icon).

Instead of creating contacts manually one by one, it would be great if Missive had a section to display a list of any e-mail that are in the inbox or sent folders (basically all previous From: or To: e-mails), something like a label "Uncategorized" or "To be sorted". It would be much quicker to go into this section and go through each e-mail in a list in order to add them, discard them or eventually even blacklist/report them as spam. Currently, the quickest way to add a contact is to use the sidebar while browsing a conversation, it's a nifty feature but if we want to build our entire contacts book this will be very tedious so there's still room for improvement. Regarding blacklisting contacts or reporting them as spam, we could also have a label "Blacklisted" so that we can go back into this should we need it. It could make sense to have a "Discarded" label, which are basically contacts that do not need to be sorted or added into a contact book (i.e: newsletter e-mails). Finally, a nifty feature with this would be to automatically detect all e-mails from the same domain so when you add bob@mycompany.com in your contact book, Missive could display a prompt along the lines of "7 contacts were detected with e-mails ending with mycompany.com , do you want to add them in the My Company profile?". All contact detected automatically would be removed from the label "To be sorted".