to commonly asked questions.

What printer should I get?

Since you primarily use gmail as your email address this should be a simple fix. You’ll want to open your mail application then go to preferences. Next, select “accounts” at the top then select the gmail account on the left hand column. Finally, select “account information” as seen below then change the outgoing server to your gmail server and check the box that says “use only this server”.
can't send out emails!!
The message box reads: cannot send message using the server

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This image is a theme.plist hack