You can post log entries via email and sailmail to SvLogBook. The emails must be in a particular format in order to extract the information and present it on the website.
Once you have created a User Profile and a Boat Profile you can get a template for posting a log entry by either:
An short automated email will be sent in response with either a "Success" or "Failure" message. If you have had issues with your Additional Optional Fields (due to incorrect formatting or the like) then it will tell you what fields had trouble and what was the cause of the trouble.
The response email will also tell you how to possibly fix the issues and re-submit/edit the post by including the 'ENTRY' keyword.