My customer recently tried emailing some .psd files ranging from 12-17 megabytes to me, but the emails never came through. My customer, saying "the email violated a content policy at the zoho mail servers," resorted to emailing to my gmail account to get the files through to me.

Is it possible to allow large .psd, .eps, .zip and other archive files (all commonly used in my industry) to come through, or should I go back to using gmail?