MIMEDefang
MIMEDefang is a GPL licensed framework for filtering e-mail. It uses sendmail's "Milter" API, some C glue code, and some Perl code to let the user write high-performance mail filters in Perl. MIMEDefang can be used to: Block viruses (e.g. using Clamav) Block or tag spam (e.g. using SpamAssassin) Remove HTML mail parts Add boilerplate disclaimers to outgoing mail Remove or alter attachments Replace attachments with URLs Implement sophisticated access controls Verify and add DKIM and ARC signatures History MIMEDefang was originally developed by Dianne Skoll, who was contracted by the Royal College of Physicians and Surgeons of Canada in 2000 to help stop the flood of email viruses to the college's network. The software was written to filter attachments and was originally called MIMESweeper, then MIMEDefanger, and currently MIMEDefang. Skoll announced her software to the public on August 28, 2000. On December 21, 2001, a version incorporating support for SpamAssassin was released, making MIMEDefang a filter for both spam and viruses. Skoll's company, Roaring Penguin Software, developed and sold a commercial anti-spam product known as CanIt, which is based on the open-source version of MIMEDefang. Roaring Penguin Software was acquired by AppRiver in March 2018. On March 5, 2020,