Articles tagged Dns

Expert insights on email security, DMARC configuration, and deliverability optimization.

dns · Dec 17, 2025

Forwarding & mailing lists: Why DMARC breaks and why you can’t ‘just fix it’

Forwarding and discussion lists are a classic DMARC pain point: SPF usually breaks, DKIM sometimes breaks, and then users blame the receiving org. We explain why this is structural, and how ARC and SRS attempt to fix it.

DMARCTrust

4 min read

dmarc · Dec 15, 2025

ESPs, subdomains, and the “Can’t get DKIM to align w/ DMARC” rabbit hole

A recurring forum storyline: you set up an ESP, authentication tools say it’s fine, yet DMARC alignment is still broken. This usually comes down to how the ESP signs DKIM (d=), whether you’re using a custom sending domain, and whether you should isolate with a sending subdomain.

DMARCTrust

4 min read