there is a nice fuction in ISPconfig adding DKIM records and functions for local managed domains, but what if Postfix is just a relay, then the domains are not listet. My situatuation I have a Opentext Groupwise 25.4 System for multiple domains. For security and other reasons groupwise sends all mail to a ispconfig (latest Version) controled mailserver, that relays mails to the internet and receives all mails for our domains to the groupwise internet gateway. Now a customer accepts only DKIM and DMARK secured eMails. As the domains are only listed under relay domains there is no DKIM option. Global DNS is at IONOS. where the domains are registrated. So I need a hint how to manage that problem. can I solve that on my local postfix? must I solve it at IONOS? Thanks for every hint or help
GROK research shows the documented way and says this works even when postfix just relays from and to Groupwise. but when I try to add a domain to Email domain ISPconfig i get an error: The Domain is already set as E-Mail Transport. so what to do. Please help
An email domain cannot be both local and remote at the same time, meaning you cannot tell your server that it is responsible for this domain and, at the same time, that it is not its domain. Currently, DKIM is bound to local domains, which means you can not use it without a domain being locally handled by the server. You will probably have to configure your setup manually.
That is what I understand, but Google research tells me that a postfix relay in front of GroupWise may be used for DKIM DMARK. As GroupWise does not support DKIM or DMARC. so does that mean I have to set up a postfix server instead of a ISPconfig controlled Mailserver, to have DKIM DMARK support and manualy configure this with opendkim i.e. Ok, but can you please give me a hint to a tutorial where this is described. Thank you
