OK Warning: Apple Mail in Leopard defaults the incoming server to SSL "ON" as well. Which AFAIK Gmail IMAP does not work with incoming SSL "ON", only the outgoing.
There is nothing wrong with leaving your email clients as-is exactly as the Gmail Help documents instruct. Unfortunately, you will start to see a little inconsistency between your email clients and your Gmail web interface.
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With my ISP port settings 587, 993 etc are very very slow, they block ports like mean motherf*ers
Take a look at both IMAP support pages for Apple Mail and the iPhone. Both share similar steps including:
Incoming Server: imap.gmail.com
Outgoing Server: smtp.gmail.com
Authentication: email@gmail.com + email password
?Use secure Socket Layer (SSL)?
Ports: 587 Outgoing, 993 Incoming
There is nothing wrong with leaving your email clients as-is exactly as the Gmail Help documents instruct. Unfortunately, you will start to see a little inconsistency between your email clients and your Gmail web interface.