The first time I tried to send archived files to/from a Gmail email account was one month ago and I noticed that you cannot send these kinds of files. I tried multiple times and failed always. If I send an email to a Gmail account, I get a reply with the text message: > This is an automatically generated Delivery Status Notification. > > Delivery to the following recipients failed. > > email@example.com Viewing the email source, I found out this: Final-Recipient: rfc822;firstname.lastname@example.org Action: failed Status: 5.5.0 Diagnostic-Code: smtp;552-5.7.0 This message was blocked because its content presents a potential 552-5.7.0 security issue. Please visit 552-5.7.0 http://support.google.com/mail/bin/answer.py?answer=6590 to review our 552 5.7.0 message content and attachment content guidelines. m3si23238476wjw.33 - gsmtp The archived files I tried were .zip, .rar, no password, with password, encrypted. None of them worked. The archive contained a Kicad project. Is there a way to circumvent this?