Hi Andy
Thank by your support
I just discovered my domain has a DKIM key configured on DNS but this was done by someone else (maybe a ISP or newsletter provider) so I do not have control over it and it is not configurated on NS7!
I think the web GUI creates a new DKIM record for domain, so I cannot use the standard config.
Trying to find out how recover the secret part of DKIM (if this exist!) and how put that key on NS7 by hand .
EDIT: just find out the key in PEM format. How to install it on NS7??
EDIT2: I just found MailServer Configuration (autodiscover, SPF, DKIM) - #40 by Nas but it’s old (2016)
Any new/updated tips about how to configure NS7 to use a -dkim.pem file I have already copy on it?