Tamper-proof emails with DKIM
DKIM is like sealing your email in a digital envelope. It doesn’t stop anyone else from seeing it and it doesn’t prevent someone from sending mail on behalf of your domain (that’s what SPF is for), but it does prove that no one changed what’s inside along the way.
When you send an email, it may travel through multiple servers before it lands in someone’s inbox. Without protection, anything could happen mid-journey: a tiny edit in the text, swapped links, or a forged message pretending to be from you. DKIM prevents that by attaching a small cryptographic signature to each message, allowing inbox providers to verify that the email truly came from your domain and that its content wasn’t altered in transit.