FeedBlitz sends abridged or truncated text even though it is set to send everything. Why?

If the source blogging system (or intemediate RSS management service, like FeedBurner) is set to produce a short feed then you need to change those settings so FeedBlitz gets to see the full feed. Check your blogging solution and / or FeedBurner RSS settings, then when you have them updated check that FeedBlitz is working correctly at Newsletters | Diagnostics | Preview.

If you use FeedBlitz to manage your mailing’s RSS feed, make sure you have posts set to full (maximum entry length should be blank) at RSS | Settings | Per-Post Customization

If you are a WordPress user, changing the article source URL from RSS to Atom at Newsletters | Settings | Content Settings | The Basics will probably result in full content mailings being restored.