General:
* Convey
* Communicate
* Declare
* State
* Articulate
* Voice
* Reveal
For feelings:
* Show
* Demonstrate
* Display
* Exhibit
For speed:
* Rapid
* Fast
* Swift
* Quick
For transportation:
* Ship
* Transport
* Deliver
For mail:
* Dispatch
* Send
The best synonym will depend on the specific meaning of "express" in the sentence. For example:
* "She expressed her gratitude." You could replace "expressed" with "showed," "demonstrated," or "voiced."
* "The train express arrived on time." You could replace "express" with "fast" or "rapid."
Let me know the context of your sentence, and I can help you choose the best synonym!