I recently tried to send someone @ gmail a rar file as an attachment.
The file was about 10k. It's a small (about 50 kb) xml file. I used
winrar (offhand not sure what version I've got - there's no intuitive
way to see the version). I used the password option and also encrypted
the file name.
Gmail said this:
Your message was rejected by gmail-smtp-in.l.google.com for the
5.7.0 This message was blocked because its content presents a potential
5.7.0 security issue. Please visit
5.7.0 https://support.google.com/mail/?p=BlockedMessage to review our
5.7.0 message content and attachment content guidelines.
(a) gmail doesn't like password-protected rar files, or
(b) gmail does real-time file-cracking and looked inside the archive and discovered an xml file and it has a policy of rejecting xml files as attachments.
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