Not only is there no practical way to mail that out (your ISP will stop you cold), the recipient would never, ever receive it.
For 270mb of photos, I would do one of the following:
1. Buy a $10 thumb drive, put the photos on it, mail it to them.
2. Burn a CD of the photos, mail it to them.
3. Use MobileMe or DropBox to upload the files, then share that folder to his dropbox.
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