The contact form poster module in Scrapebox allows you to automatically submit your messages to contact forms in mass. Scrapebox comes with multiple platforms supported out of the box and you can train your own.
Scrapebox also includes built in footprints for the platforms that it natively supports, so it makes scraping such platforms simple.
All you need do is fill your name, mail, subject, message and the list of websites to post to. The contact form poster optionally supports captchas for improved success rates.