New user e-mail default from: address

Every new account that we create in a tenant receives a welcome e-mail from the workspace. I think this is standard from the email address of the person who created the account, for example: admin@tenantnaam.nl

Because of the way in which we sell the workspace, it is often not possible to adjust the spf record for each dns domain, so these emails end up in the spam box. That is why I would like to have all these e-mails sent under one e-mail address such as: support@prodeta.nl is this possible?