Generally speaking, most workers for an office understand they'll be receiving internal emails, so those fall within email permissions. Do keep in mind that we still need to include unsubscribe links in the legally-required footer of any emails sent through us.
If you're going to be doing internal sendouts, I'd advise making sure you have self-authentication set up for your account, otherwise the emails are likely to be treated as spam since they're actually coming from a separate source (us), rather than truly internally. If you have a dedicated IT security person or team, you'll also want to make sure they get our domains to safelist.
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