The Internet Protocol Journal, Volume 23, 2020 Article Author(s) Page ------------------------------------------------------------------------------- * Volume 23, No. 1, May 2020: Network Buffer Sizes Geoff Huston 2 Mail Security with DMARC and ARC John Levine 21 Letter to the Editor Berke/Huston 35 Thank You Editorial Staff 40 Supporters and Sponsors Editorial Staff 43 * Volume 23, No. 2, September 2020: Link-State Protocols on Data-Center Fabrics White/Aelmans 2 The IPv4 Marketplace David Strom 20 In Memoriam: Yngvar Lundh Ole Jacobsen 34 Book Review: Transforming Information Security Mirjam Kuehne 36 Thank You Editorial Staff 40 Supporters and Sponsors Editorial Staff 43