Only recently I came across the possibility that e-mailing files may change and damage those files. Especially when mailing *.jpgs to web-based mail servers like Gmail or Outlook.com: I wouldn't be too surprised if these services re-compressed my files—possibly even stripping the colour profile in the process.
Since I do most of my file delivery by e-mail, this may be especially relevant when mailing *.jpg versions of logos and ads.
So here come my questions:
- Is there a risk of data loss occurring when mailing image files to certain mail services? If so, how big of an impact does it have, and on what file types? And what mail services should I look out for?
- How can I prevent such data loss? Is a *.zip protected from recompression?