Do anti-virus programs block the recipient from receiving the encrypted attachment?
CenturionMail allows you to send the encrypted attachment in ZIP, CAB, or EXE format. While EXE is the easiest format for the recipient, in most cases it will be blocked by anti-virus programs. In almost all cases you will send the attachment in ZIP or CAB format – which can be opened by most recipients. These have been tested on all the major anti-virus programs and are not blocked unless the system administrator has specifically blocked ZIP or CAB formats.