Finally, I have seen all too many fraudulent appeals couched in a chain letter's wrapping. If you feel there is a need to gather email addresses, messages for a grieving or injured person, or any other heart-felt cause, web boards, guestbooks, and Blogs exist. Setting one up will earn you work requirement. If you are using Microsoft Outlook, set it to plain text. People with Eudora, Pegasus, or a shell account get a long string of unreadable numbers.
Graphics are heavy users of bandwidth, and a mailing list is for words.
If you want to send thankyou graphics upload them to your site for public consumption and let those on the list know the URL or send them privately back channnel. Back to the top of the page. Spam is unsolicited mail from advertisers. What will happen, however, if this is your fist discussion list is you will see significantly more mail in your mailbox. I am a notoriously bad predictor of traffic.