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Prevent outbound Audio Attachments (MIME)

Hi All,

We have an internal exchange 2013 server and a Sophos SG310 cluster (9.354-4)

We are trying to prevent outbound emailing of call recordings.

I tried the Antivirus/MIME type filter with Audio selected, but this only seemed to affect inbound emails.

I suspect I must need to use Data Protection/Custom Rules?

If so can someone please provide an example custom expression

Help appreciated

Cheers - Ro



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