Check out the lightweight on-premises email archiving software developed by iRedMail team: Spider Email Archiver.
With iRedAdmin-Pro, you can simply add mail forwarding addresses in user
profile page, under tab
To forward emails to other email addresses, you can add value in LDAP attribute
mailForwardingAddress of user object.
For example, if you want to forward all emails sent to
Login to phpLDAPadmin (https://[your_server]/phpldapadmin ) as LDAP root dn
cn=Manager,dc=xx,dc=xx or 'cn=vmailadmin,dc=xx,dc=xx'.
Find the LDAP object of email account which you want to forward emails in left panel of phpLDAPadmin, click the ldap object, phpLDAPadmin will show you detailed LDAP attributes/values in right panel.
Add a new LDAP attribute
mailForwardingAddress to this mail account, set
value to first forwarding address
Repeat step #3, add another email address:
Save your changes.
Now all emails sent to
firstname.lastname@example.org will be forwarded to both
If you want to save a copy of forwarded email, please add
additional value of LDAP attribute