PostGrid has been great for automating our insurance mails for our client
Send Mail Get Mail - A postcard-sending website.
Postalytics - Automated direct mail software that’s faster, smarter & better. Postalytics sends personalized direct mail from your CRM and analyzes delivery & response.
The Simple Postcard - Text a photo to mail it as a postcard
Lob - A simple API to integrate print & mail solutions into your applications.
NanaGram - Text your photos and we'll mail 4x6 prints to your Nana.
AmazingMail - Business print-mail solution