I recommend you to guide you here since it seems something of the mail delivery associated with cyberpanel, I also recommend that you use the command tail -f /path | grep domain.com and with cntrl+c you cancel the previous command
so you can have the results in real time
https://community.cyberpanel.net/t/how-to-manually-set-up-spf-dkim-and-dmarc-inside-cyberpanel/30666
[How to Build Free SMTP Server with CyberPanel in 5 Minutes]
Sending emails to the inbox is always a tricky thing for even experienced system administrators, running a healthy email server requires great attention. I will be mostly talking about transactional emails in this article, even though it can be applied to marketing emails. Some companies process a large number of transactional emails on daily basis (in millions). Transaction emails involve:
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DKIM Signing Starting version 1.6.4 you can now check whether you want to setup DKIM DNS records for your domains. If OpenDKIM is not installed, it will prompt you to install OpenDKIM, which you can do so via pointing your browser to: ...
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