Keeping gmail and Apple Mail sent folders in sync

This page has an neat tip on how to keep the sent mailbox in sync in Gmail and in Apple mail.

With this tip, if you send a mail through the Gmail web interface, it will appear in your sent folder in Apple Mail, when you next check mail.  Built into the POP/SMTP interface, it already works the other way around.  When you send a message through Gmail's SMTP server, the message is automatically added to your sent folder.

The only addition to the script was to add the condition:

• Account <gmail account name>

[via atmaspheric bookmarks]