Email filter by attachment extension

Discussion in 'General' started by blinden, Dec 18, 2018.

  1. blinden

    blinden Member

    We are seeing a large increase in very convincing malicious word documents coming through to our users. I would like to create a filter to move .doc attachments into a "Potentially harmful" folder. There is no real reason why any of our clients or vendors should be sending us .doc with any regularity, but occasionally something legit may come through.

    I would like to do this on a per user or per domain level, because accounts on other domains may not want to implement this change.
  2. Jesse Norell

    Jesse Norell ISPConfig Developer Staff Member ISPConfig Developer

    There is no way to create per-domain filters (that would be worth creating a feature request for), and I don't see a way to do it in the mail filters interface either, so you would have to create custom sieve rules for that. You could create a postfix header rule (mime_header_checks) to add a header to messages with a .doc attachment, then a sieve rule to move those to some folder as needed.

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