Gmail will not allow a zip attachment.
I just sent one and received it in a yahoo account.
I have been distributing my software licence key as a zipped file since 2002. Sent more than 10,000 and i could count on one hand the number of clients that haven't received it. Sent five today, no problem.
Because the key is an encrypted text file and contains non-ascii characters some mail programs deliver it corrupted if I send it raw.
So I zip it.
I'm saddened to hear that some people feel that file compression is a dangerous tool of the devil.
RIP Phillip Katz
@Craig G I realise we are getting way off topic but I'm curious how you email 30 or more attachments as that is often the case for me.
All my clients use either Dropbox, Citrix Share, SFTP server, Cloud or some other comparable secure service for that purpose. The corresponding link is placed in the email itself.