The amount of unknow devices detected is quite high

[mikevh]

Your software
My Mautic version is: 4.4.10
My PHP version is: 8.0
My Database type and version is: percona

Your problem
My problem is: When looking at the mail stats we noticed that the amount of unknows are really high. For all mails.

What could be the cause?

[EJL]

Email server parsing your content and links for anything malicious before delivery to the email user. Especially true if you are in the B2B space, but every major email provider does it.