I would recommend a subject line similar to:
No attachments please!
on a monthly basis.
> ----------
> From: Tony Moss
> Sent: Monday, September 20, 1999 5:14 AM
> To: Sundial Mail List
> Subject: Reminder (tryout) XXX YYY XXX
>
> All new subscribers to the Sundial Mailing List are reminded that only
> text messages should be sent to The List. Images in any form, JPEGs,
> GIFs etc MUST NOT be attached to messages. If you wish to share images
> then send a text message inviting individuals to make contact or place
> them on a website and give notice of the URL.
>
> ***********************************
>
> Unless there is strong disagreement I could send out something similar to
> the above at regular intervals. The distinctive title with XXX YYY XXX
> would allow other members to discard it unread.
>
> Tony Moss
>
