3. Further Preference Settings
By now, you’ve set up your Mail account for your free Yahoo! Mail account. But we’re not done yet. On the Preference pane of Mail 
, go to Accounts then select the Advanced tab. I personally prefer keeping my mail on my Yahoo! account so I uncheck Remove copy from server after retrieveing a message. I raise this because there might be people who want to keep both copies online and on their Mac. Change the port to 2000, then save your settings.
Get mail and you’ll notice your Yahoo! Mail’s popping your messages from your Inbox. Make sure you run MacFreePOPs before launching Mail. It will fetch contents from your Yahoo! Mail inbox.
4. A Few More Tricks
The current set up of your Mail is that it fetches your @yahoo.com inbox, but sends out using your @gmail.com email. This might pose a problem since our configuration is:
- Fetch from Yahoo! inbox
- Send emails using Gmail
Whenever we send out emails the account being used is Gmail. If a recipient replies, the email will go to Gmail, which is the wrong inbox since we're fetching from Yahoo! There are two things you can do (and I suggest doing both) to prevent this from happening, consequently keeping your email exchanges Yahoo!-centric.
5. Auto-Fill the Reply-To Fields
One solution is provide an entry in the Reply-To field when you create new mails. But for those who often forget, like myself, you can automate filling this field via Terminal.
You can dictate via Terminal that all mails sent out from Apple’s Mail be replied to a specific email address. In this case, we want everything to be replied to your free Yahoo! Mail account.
- Open Terminal
- Type defaults write com.apple.mail UserHeaders '{ "Reply-To" = "replytoaddress@yahoo.com"; }'
- ("replytoaddress@yahoo.com" is the specific email address you want people replying to).
- Press Enter
- To check if your desired email was entered properly, you can review the Reply-To address by typingin in defaults read com.apple.mail UserHeaders and press Enter. It should return the Yahoo! Mail address you specified.
6. Auto-Forward Gmail to Yahoo!
I personally don’t use Gmail and only have an account solely for the purpose of being able to send out using Apple’s Mail, and I like running my digital life around Yahoo!
Sometimes I occasionally get email sent “wrongly” to my Gmail accounts. To avoid this, you can set Gmail to forward whatever it receives in your inbox, to your specified email address.
Log on in your Gmail account on the web and…
- Click Settings
- Go to the Forwarding and POP/IMAP tab
- Choose "Forward a copy of incomping mail to" and input your Yahoo! Mail address
- Choose if you want to either keep, archive, or delete Gmail's copy in its inbox.
- Click on Save changes
Once all of these are done, you can enjoy your free Yahoo! Mail to send and receive by running both MacFreePOPs along with Apple's Mail. Enjoy!