@RazielKanos

Yeah, Cloudron could work for this. Cloudron is pretty flexible in terms of how it does emails. Just make sure you use a relay like Amazon SES or Postmark for a bit better deliverability.

For something like this, I'd do it a little differently than @luckow would do it, but pretty similar.

Create accounts for users on Cloudron.
Create email addresses for each of them (e.g. firstname.lastname@yourdomain.com)
Create shared email addresses (e.g. sales@yourdomain.com) and assign permissions to it for the particular users.
Have the users log into both their user email addresses (firstname.lastname@yourdomain.com) and their shared email addresses (firstname.lastname@yourdomain.com) using their user account's password. Yep, you do not need a password specifically for your shared email account
For Email Clients, you can set up any IMAP client, such as Outlook or Thunderbird. You can also set up SOGO/Roundube/SnappyMail as a webmail client. It's not going to be a smooth as Gmail, but it an be pretty good. (More details on these clients below).
To give colleagues access to a mailbox, you can assign them access temporarily in Cloudron, and then revoke it when finished. They can then log in via the webmail client you chose using (your.email@yourdomain.com) and their own personal email account password (not yours).
I'll also note that it's possible to set up SOGO and Snappy Mail a bit like Outlook and Thunderbird to access multiple email accounts at the same time. However, as said, SOGO is not quite as smooth as Gmail.

I hadn't tried Freescount until just a moment ago... it seems like it's great, and it could be a good alternative to shared email inboxes. Personally, I've seen cases where people sort of do a similar thing with synchronizing IMAP Tags in Thunderbird, but this definitely seems a lot more streamlined (in particular, for service cases). It also seems like it'd be a good way to manage permissions for personal inboxes (like I Was talking about in Step 6), but you could have the users do that, rather than have to do that as the administrator. I do wish that they had subfolders though... so I'll probably be sticking with Thunderbird .
In terms of SOGO v Roundcube v Snappy Mail, in my personal opinion it goes like this. Most of the features on these email clients are the same. SOGO has the most features, followed by Roundcube, and then Snappy Mail. Three features which might or might not be important to you are Multiple Accounts Displayed in a Single Webmail GUI, Vacation Replies, and CARDDAV syncing. SOGO has all three. Roundcube just has vacation replies (but has many other features). Snappy mail has Multiple Accounts, CARDDAV syncing, and Vacation Replies (although the last one is a kinda, as it is not non-technical user friendly to be honest). In terms of how 'quick' the webmail clients feel, it's the opposite. Snappy mail is the fastest, then Roundcube, then Sogo. So it's all a bit of a tradeoff there.
One final thing to note is that running your own email server like this does take a little bit more work than having someone else hosted. But it's also a great deal cheaper, especially when you need more accounts. So I personally find it worth it, but your mileage may vary.

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