You are trying to send an email in Outreach, but you're seeing the error: We were unable to send your message: An internal error occurred.
One-off, bulk compose, and sequence emails
Check the message body for any images. If the image was copied/pasted into the template body, remove it, and instead use the Add image feature in the editor toolbar. Once you re-add the image back, you can resize it again if you need to.
Sometimes when an image is copied/pasted into the message body, it can create sizing issues when trying to send the message. We always recommend using the Add image button in the toolbar when you need to add an image to your template or message body.