Here’s an excerpt from a hint about optimizing Leopard Mail for accounts that support “push” (like and gmail):

…this is a great way to keep your mailboxes up-to-the-second current without having hog the bandwidth, checking every minute or five minutes.

If your server supports IDLE (Gmail, .Mac/MobileMe, and most university servers do), then the only things you need to do are:

Go into Mail » Preferences » Accounts (Advanced) and make sure that Use IDLE command if the server supports it is enabled (it’s enabled by default).

(This is the fun part) Again go into Mail » Preferences » General and set Check for new Mail to Manually.

And robg adds an important note:

If you have a mix of accounts some of which include IDLE support and some which don’t (as I do), here’s another way to set this up. For the IDLE-enabled accounts, uncheck the box next to ‘Include when automatically checking for new mail’ on the Advanced tab of that account’s settings pages. For the non-IDLE accounts, leave this box checked.

Then, in General in Mail’s Preferences, leave the ‘Check for new mail’ pop-up set to whatever time interval you prefer. This way, your IDLE-enabled email will show up as soon as the server pushes it to your machine, but you’ll still check the non-IDLE accounts on a regular basis. This works quite well for me — three of my accounts have IDLE enabled and the email just shows up, while the other two accounts are checked using Mail’s automatic checks.]

One problem, noted by EricMc, which I too have experienced is:

When using the idle support in many people experience issues with new mail sounds or sounds triggered from scripts not playing or playing much later than expected.

Does this screen look familiar?

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If you’re constantly having to click “Always trust XXX when connecting to XXX” when using Mail with SSL on, your solution may be a few clicks away.

In the above image, notice that it says “Always trust “” when connecting to “”.” The problem here is that Leopard won’t ever trust a certificate (even after clicking the check box) when the server you entered in your account details doesn’t match the server name the certificate is using.

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In this case, should be changed to to reflect the name of the server on the certificate and the problem goes away like magic!

Here’s another slightly more complicated example…
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You can drag-and-drop an e-mail message from Mail into iCal, but only in iCal’s Month view! I wish I would have tried this sooner, but I never use month view.

Drag-and-dropping into Month view creates an event with the Mail message link/alias that, with one click, opens my e-mail message in Mail. Perfect for setting a reminder to read an e-mail at a specific day/time.

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