Every email you send has three possible address boxes, and they do not mean the same thing. By the end of this page you will know exactly who sees what when you use To, Cc and Bcc, and how to avoid the most common and most embarrassing mistake in email: hitting Reply All by accident.
When you open a new message in Outlook, you will usually see a To field, and often a Cc field sitting just below it, with Bcc hidden until you switch it on. These three boxes decide who receives the email and, just as importantly, what each recipient can see about who else received it. Understanding the difference stops you sending the wrong information to the wrong people, and it stops your inbox filling up with replies that were never meant for you.
- Expected to read and reply
- Kept informed, no reply needed
- Hidden from everyone else
Think of To as the people the email is written for, addressed by name, expected to respond. Cc is like leaving a copy on someone's desk so they are not surprised later, common when you want a manager or colleague to see a conversation without joining in. Bcc is different in kind, not just in visibility: everyone in the To and Cc fields sees each other's names, but nobody sees who was Bcc'd, and people who were Bcc'd cannot see each other either. This makes Bcc useful for two very different purposes, sending to a large list without exposing everyone's email address to everyone else, and quietly looping someone in without the main recipients knowing.
Try it yourself
Start a new email by clicking New Email on the Home tab, then look for the Cc and Bcc links near the To box; if Bcc is not showing, go to the Options tab and click Bcc to switch it on.
Bcc is hidden by default in a new message, so many people never realise it exists until they go looking for it.
Put the one or two people you actually need an answer or action from in the To box.
Everyone in To assumes the email is aimed at them, so keeping this list short makes it obvious who is responsible for replying.
Put anyone who just needs to be kept in the loop, such as a manager, into Cc rather than To.
Cc signals 'for your information' rather than 'please respond', which sets the right expectation and avoids confusing replies.
When emailing a large group where recipients do not need to see each other's addresses, such as a community newsletter, put your own address in To and everyone else in Bcc.
This protects everyone's privacy, since nobody on a Bcc list can see who else received the message, and stops the dreaded 'reply all' chain reaching hundreds of strangers.
Before clicking Send, glance across the To and Cc fields one more time and ask yourself whether everyone listed genuinely needs this particular email.
It is far easier to check the address boxes for ten seconds now than to recall or apologise for a message sent to the wrong audience.
Words people use
Once you are in the habit of pausing on the address fields before sending, this becomes second nature rather than an extra chore. Choosing To, Cc or Bcc thoughtfully is one of the simplest ways to make your emails feel considerate and professional, because it shows you have thought about who actually needs to see what.
Check yourself
If you can say yes to each of these, you are ready for the next lesson.
- I can explain the difference between To, Cc and Bcc.
- I know how to switch on the Bcc field when it is hidden.
- I can use Bcc to protect a large group's email addresses.
- I know to check the recipient list before using Reply All.