When sending large attachments, always “zip” or compress them before sending.
Never send large attachments without notice! Always ask what would be the best time to send them first.
Learn how to resample or resize graphics to about 600 pixels in width before attaching them to an email. This will greatly reduce download time.
Never open an attachment from someone you don’t know.
Be sure your virus, adware and spyware programs are up to date and include scanning of your emails and attachments both incoming and outgoing.
It is better to spread multiple attachments over several emails rather than attaching them all to one email to avoid clogging the pipeline.
Make sure the other side has the same software as you before sending attachments or they may not be able to open your attachment. Use PDF when possible.