Google blocking 7zip

Ian Batten igb at
Mon Apr 7 12:14:21 BST 2014

On 2 Apr 2014, at 08:57, Richard Hopkins <richard.hopkins at> wrote:

> --On 28 March 2014 11:04 +0000 Richard Hopkins <Richard.Hopkins at> wrote:
>> However, *all* .7z (encrypted) archives are blocked, whether they contain
>> "dangerous" attachments or not.
>> I'm hoping that Google have made a mistake here which they will recognise
>> and fix real soon.
> Which they appear to have. Encrypted .7z archives (so long as they don't contain "dangerous" attachments)

How do they tell what the contents are?  Does the 7z format allow the table of contents to be read without having the passphrase?


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