You are seeing an issue where some of your sequence emails and messages are going to your spam folder in your Email.
Outlook and Gmail
Check the content of that sequence message. There may be a bad/malicious link that you are unknowingly using, and your mail server is flagging that.
Outreach will always use your email to send your message. We do not send from our server or our domains. If any of your Outreach emails are appearing in your spam folder, make sure to unmark those and check the contents of your message for anything that may be flagged by your mail team.