The first time I tried to send archived files to/from a gmail email account was 1 month ago and I noticed that you cannot send this kind 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. > > firstname.lastname@example.org Viewing the email source, I found out this: > Final-Recipient: rfc822;email@example.com 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 **Is there a way to circumvent this?** The archived files I tried were zip, rar, no password, with password, encrypted. None of them worked. The archive contained a Kicad project.