There is an administrator user (username: admin) which can be used under mail.example.com.
You can create a separate domain administrator to delegate access for certain domains:
open mail.example.com and login as administrator
select access and scroll down
select Add domain administrator
Configuration (top right) -> Mailboxes -> Add domainand fill in your domain name
add the new domain with
Add domain and restart SOGo
Configuration (top right) -> Mailboxes -> Mailboxes (tab) -> Add mailboxand fill in your desired Username, Full name and Password
save your settings with the
The new user can now
login to webmail on webmail.example.com (SOGo with integerated calendar and addressbook)
login to mail.example.com to adjust certain settings (Spam filter, Sync jobs)
access his mails in a mailclient like thunderbird or outlook with IMAP/SMTP or ActiveSync.
You can import your old email with a Sync Job.
Configuration (top right) -> Mailboxes -> Mailboxes (tab) -> Sync Jobs
Create a new sync job with your settings
A sync job remains until you delete it. Remember to delete the sync job if you no longer need it.