There is currently a quota of five messages per day. A sixth message will result in a one-day timeout. Subsequent infractions of this quota rule would earn you longer timeouts. Attachments Do not send attachments without permission, except for short text files. A large number of people will not be able to read the files and many will not even be able to receive them.
Some people here have limits on the sizes of messages they can receive.
If you wish to transmit an image, document, or other file, please find another place to make it available, like a web site, and send to the list an announcement of the file's availability.