This is especially so if the site is located overseas. Use your University of Wollongong electronic mail service, or the webmail service from the University. This webmail service is similar to the hotmail services offered by commercial sites. This facility is free to all students and staff of the University. You will be able to forward electronic mail from other accounts to the webmail account or vice versa.
Images consume more bandwidth than text.
Turning the images off while you are searching for information would save your quota. Think about what you download - movies and audio consume a large amount of quota. Downloading video and audio files or using streaming video or audio will quickly use up your quota.