Windows people, if you are using Outlook: I use email signatures to fill in little blocks of common text.

Just give the signature a good name, and don’t set a default. Then your text is available as a dropdown from the signature button.

For longer ones, I keep a Word document with some boilerplate that I can tweak as necessary.

I’m the web manager for a college, and I am the triage point for our site’s main contact form. This really saves me time, which means I can pay more attention to either internal emails, or those external emails that are really unique!