It is never appropriate to send this kind of message to the list itself. If you have trouble with your subscription, send email to the list administrator explaining the problem.

Please turn off HTML in your email, and do not send attachments in your messages; if you want to share something formatted or large, put it on a website or ftp site and share the URL.

More and more ISP's are installing mail filters. Some of them will bounce suspected spam to the list owner or the original sender, and some will send mail to the list owner asking for some sort of confirmation or response. The latter will not happen: you're responsible for your own spam filters, so if you suspect you are not getting all the messages you should check the on-line list archives and compare them with what you've received. If you run into trouble, it may help to switch mail servers.

The list owner also receives bounces complaining about full mailboxes. These will be ignored for several days, but after a longer period the address will be removed from the list. If you return from a long trip to a full mailbox, you may need to re-subscribe.