The Mailing-List works through email and attaching files is a bad idea. Some users still have limited bandwidth, or pay per kb download
Think this way, you may have a 10Mbit connection, and your email with picture arrives in 2 seconds, your not worried, but for someone on a 56Kbit or even 28Kbit connection, that same email could take about 400 seconds and 800 seconds respectively, and that assumes it doesn't time out.
If you really are desperate for people to see your picture or media ask them to e-mail you personally or post it to the Web and give a link. Remember, give them the chance to decide, don't force it upon them.
FAQ answers attributed to Raymond E. Feist are copyright by Raymond E. Feist.
It should also be born in mind that the answer given was only applicable on the date written, and to a specific question. You may find further, similar questions, in the FAQ.