Mail 'send' button or meneu won't send e-mail.

Question

Out of the blue, after each word typed, Mail started noting that 'Spell Catcher' couldn't be found ! (Haven't used it in months, since upgrading to 10.4.4)
Changing Mail prefs to 'check spelling when sent' or 'check spelling- never' allowed more typing but still wouldn't send. I receive ok but can't send from ANY of the mail boxes.

Answer 1

Try resetting Launch Services. The following article describes how to do that manually -- the notes at the bottom of the article also provide information about the side effects of deleting each of the files involved:
Resetting Launch Services
If you prefer using a cache cleaning utility instead of following the manual procedure described in the previous article, this other article provides links to some utilities that can be used for troubleshooting and cache cleaning:
Resolving Disk, Permission, and Cache Corruption
It seems that the most appropriate utility for solving this particular problem is Tiger Cache Cleaner, but you may also want to consider other utilities, such as OnyX, or Cache Out X, which are free. Whatever utility you choose, be sure to read this first:
Side effects of System cache cleaning
As an example, this is how you should proceed with OnyX:
1. Quit all applications.
2. Launch OnyX and enter your administrator password.
3. Click Maintenance. In the Reset section, check LaunchServices database.
4. You may uncheck any other pre-checked options if you wish.
5. Click the Execute button.
6. Restart the computer.