OutboxSMS currently strips all CR and LF from emails before they are processed into SMS messages. The reason for this is that we have found that emails tend to have a large number of superfluous CR/LFs inserted. This is ok in email world, but makes the SMS message pretty much unreadable when it is converted. So, we just remove them.
I’ve logged this as a feature request, so an option to remove/leave CR/LFs may appear in a future OutboxSMS release.