You might have used Microsoft Outlook as your preferred email client. I have also used Mozilla Thunderbird but I would personally prefer Outlook Express Email Access as my Email Client for sending and receiving mails.When you type any email, you should check for spelling before you send it. You just have to make small changes in setting to configure Outlook 2010 Spell Check & Auto-Correction option. It would help you to check any emails for spelling correction.If you are looking for how to Turn on Spell Check in Outlook 2010, you will find detailed information from here.
How to Setup Outlook 2010 Spell Check :
Step 1 : Open your Microsoft outlook 2010 and now navigate to file option there. You will find few options like save as, save attachment, info, open, print, help, option etc.
Step 2 : Now click on Option button there, so new window will be opened. From there you can set and Enable Spell Check in Outlook.
Step 3 : From that new window opened, you will have to go into mail option. From there there will be ABC like option. Check the first option that says Always check spelling before sending. And save it. You have done.
See also: Add Email Signature in Outlook
Outlook Spell Check & AutoCorrect
Now if you want to go deep into Outlook Spell Check Settings for advanced setting, you can click on the button beside that checkmark, click on the spelling and auto-correct button there. You will find advanced Outlook Spell Check Settings window there.
You can configure outlook for ignore words in Uppercase, ignoring or flag keywords, create your own custom dictionaries, check grammar in outlook and much more under Proofing option of that advanced setting. Under advanced option you would find more option for Grammar Check in Outlook 2010 setting there.