This is from a supported shared hosting grommunio installation. Last updated on 11. April 2025.
My customer has 2 domains, whereas one is the primary and the other one should just be used as alias-address for incoming mails and as sendas address for outgoing mails.
For now, I solved it this way:
Create primary domain and create normal user mailbox thomas.meier@primary.ch
Create secondary domain and create shared user mailbox thomas.meier@secondary.ch
Add both domains to the same organization
In grommunio webadmin edit shared user mailbox thomas.meier@secondary.ch and under PERMISSIONS add thomas.meier@primary.ch to the "send as"
Proceed to SMTP and add under E-Mail forward a forward type "CC" and Destination thomas.meier@primary.ch
I now login in webmail of user thomas.meier@primary.ch and add in the settings as sender address thomas.meier@secondary.ch and enable the visibility of the sender field in the new mail editor.
So far so good, that works. I can send mail as both users from the primary mailbox. I do also receive mails for both users in the primary mailbox.
But somehow I feel, that this clumsy and a lot of effort.
Also, the E-Mail forward type "CC" seems wrong, but the more appropriate type "Redirect" did not work, never received any redirected mail to the primary mailbox, only with CC, which leads to mails being sent to both mailboxes, which is not optimal.
Is there a simpler way to achieve the same goal?
