58mb for work samples is huge!! How are you producing your portfolio?
Simple ways to make your samples email friendly:
• You should only be sending samples of your best work to prospective employers (6 or 7 pieces is enough). If you send everything you've ever produced, there's nothing left to wow them with at interview!!
• Build your portfolio in InDesign or Quark and not in photoshop! (photoshop rasterizes EVERYTHING so files become huge images and text will appear very low res).
• Set images to the correct size, (ie; don't place an A3 size image into an A4 page and scale to fit as the pdf will be made using the original image size thus bloating the file).
• Your samples are never going to see a professional printer so don't worry about making everything 300dpi. (150 is ample for screen viewing and office printers).
• Many employment websites who require portfolios to be uploaded will have a stupidly low file size limit and so you'll need to make a 'smallest file size' pdf of your samples solely for this reason (an employer who's interested in seeing you will ask for your work samples and CV again anyway).