Disable Mail / Swiftmailer

Hey guys,
I’m having a weird issue. I keep getting an error when running the process-manager:maintenance or pimcore:maintenance commands. Something about “Address in mailbox given [] does not comply with RFC 2822, 3.6.2.”.
I don’t want/need any emailing capabilities at this moment, as I’m using pimcore as a data storage/organizing system. But because of this, I can’t run the commands above which are pretty important.
So, how can I disable/ignore the emails settings? Or where should I enter junk data that makes the check pass without actually caring about emails being sent?
I tried changing the Email settings in System Settings, still get the error.
Btw, I’m new at symfony & pimcore.

Thanks for any help!