https://bigboxhosting.com/blog/ Engineering perspective on email infrastructure, deliverability, and the regulatory landscape from the BIG BOX Hosting operations team. en-gb © 2026 BIG BOX Hosting d.o.o. Wed, 22 Apr 2026 00:00:00 GMT Astro static build 1440 https://bigboxhosting.com/blog/dkim-key-rotation-2026/ https://bigboxhosting.com/blog/dkim-key-rotation-2026/ Wed, 22 Apr 2026 00:00:00 GMT hello@bigboxhosting.com (Mikael Vainiomaa) The procedure looks simple — generate a new key pair, publish on a new selector, configure the MTA. Three steps. Here is what actually goes wrong, and the operational sequence that prevents it. dkim authentication operations