Currently mailcow is used in the Email Node by default in your Private Cyberspace (assuming you are an average home user).
Your application integrator should have your Email Node set up with usable defaults, so you should NOT need to touch it unless you are not satisfy with the result.
Usage
Receiving Emails in Cloud Services
Cloud Services can send legitimate incoming emails to junk or spam email folders. Some of the following tricks might help in whitelisting those emails.
Add the FROM email address into your address book to indicate that you know about the sender.
Move email into your PRIMARY inbox.
Versions
It is best practise try to go to the latest stable version of any software. The Mailcow versions are listed here:
Mailcow comes with a builtin webmail so there is no need to install email clients on your devices in most cases.
Release
Mailcow normally bundles the latest release of SOGo.
Privileges
SOGo optionally allows external access to contacts and calendars by the use of Confidentiality Levels.
Confidentiality Levels:
"Public", "Confidential" and "Private".
1 to 4 Privileges can be assigned to each of the above Confidentiality Levels:
"DAndTViewer", "Viewer", "Responder" or "Modifier"
"DAndTViewer"
Can see date and time an event is scheduled, but nothing more.
"Viewer"
Can see date and time and subject and notes and attached
links for events.
"Responder"
Can see date and time and subject and notes and
attached links for events and can accept/decline invitations.
"Modifier"
Can see date and time and subject and notes and
attached links for events and can accept/decline invitations and can
modify all attributes of events.
If Privileges are not set, then it is none.
Encryption
SOGo S/MIME limitations:
SOGo can only store one certificate at a time. Therefore you can not read old encrypted emails (== encrypted with an expired certificate).
SOGo stores the private key unencrypted in its database.
SOGo memorizes public keys only for addresses which exist in the personal addressbook (== used for sending encrypted emails).
With the other open source web based email client SnappyMail going out of maintenance (as of 2025-07-01), if you want good open source email with encryption support you should use Thunderbird.