Your email errors are telling me you cannot connect to your IMAP server. Check your credentials and see if you can do a connection test.
Also there’s this:
opened 05:46PM - 25 Jan 22 UTC
Type:Bug
Status:Fix Proposed
Priority:Important
Area: Emails:Config
#### Issue
Outbound Emails test email functionality does not use correct passwo… rd after mailbox is saved then re-opened
#### Expected Behavior
Once re-opened in editivew, the test email should use the password set in the DB unless new password has been entered
#### Actual Behavior
Outbound mail can't retrieve password so the system mailbox password is used instead
#### Possible Fix
#### Steps to Reproduce
1. Go to admin->Outbound Email
2. Set up a valid outbound email account
3. Save
4. Re-open in editview and use test email functionality
#### Context
Unable to test email is valid without knowing the password
#### Your Environment
* SuiteCRM Version used: SuiteCRM 7.12.2
* Browser name and version (e.g. Chrome Version 51.0.2704.63 (64-bit)): Chrome latest
* Environment name and version (e.g. MySQL, PHP 7): MySQL, PHP 7.3
* Operating System and version (e.g Ubuntu 16.04): Ubuntu 18.04
Also I’ve found the “ssl” dropdown, while does save, does not repopulate when you re-save. So you have to make sure it’s entered every time before you re-save.