What do you mean send but not receive? Changing gmail's pop3 and imap settings apply to allowing a client like Mail or Thunderbird to grab messages from gmail. Are you using Mobile Me? If you use Mobile Me and try to send mail as your gmail email address from Apple's server, it will refuse. You will have to log in to google's smtp server to send mail as your gmail address.
But I still don't understand what you mean in your original post. POP3 is never for sending mail. It is for receiving mail. SMTP is for sending mail. Can you clarify what you mean by send but not receive in your first post? If you mean you want to prevent messages from getting downloaded to mail.app, you take care of that on your Mac by disabling checking mail for that account.
LoL... what's with all the confusion? OP is asking to send mail but would not like to receive any.
Yes it's possible.
Simply set up mail like normal but set it to not check for mail automatically. As long as it never checks, you'll never get mail and can still send out mail like normal.
Yep. OP, just to make it even more clear, this is what youre looking for:
Also, if you dont put in the password when it asks, if it ever does try to check (which I think it still will if you manually check for new mail using the Get New Mail button or menu command), it will have to ask for the password and you can just hit cancel.
Here what you need to do.
1)Open Mail and go to preferences.
2)Click on the account your dont want to receive emails from.
3)Replace the incoming server with anything like a single alphabet or number.