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Close the settings window and click Save to accept your changes. Mail will create its own Trash folder that is stored locally on your Mac, but in Gmail on the Web, messages will be archived and searchable. This is the other half of the feature we set up in step 3.
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But thanks to zippy Macs, powerful servers, and bountiful disk space these days (even online), Gmail takes a different approach by defaulting to an “archive” behavior. This behavior made sense in the past when disk space was a precious commodity and e-mail programs and services could get bogged down if they had to organize too many messages.
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When you delete messages from Mail (and most typical e-mail clients), the program moves them to the Trash folder for disposal.
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If you opt to follow step three to automatically archive Gmail messages that you trash in Mail, you might also want to hide Gmail’s Trash label from your IMAP clients. Note that you’ll have to log into Gmail in a browser if you need to look up messages with any of the labels that you excluded from Mail, including archived messages.
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Also, feel free to hide any other labels that you don’t need while offline, or labels for any of your Gmail rules that might create unnecessary duplicates in Mail.
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