Tagged “one-click-unsubscribe”

18 June 2026 · 11 min read

The Google and Yahoo sender rules, one year on

A year after Google and Yahoo made authentication mandatory for bulk senders, here is what changed, how mail failed, and where enforcement is heading.

17 June 2026 · 14 min read

How to add DMARC, SPF and DKIM records on Cloudflare

A precise, Cloudflare-specific walkthrough of publishing TXT and CNAME records for DMARC, SPF and DKIM in the Cloudflare DNS editor, with the real gotchas: root versus host name, the orange-cloud proxy, automatic TXT chunking, CNAME flattening at the apex, TTL on Auto, and Email Routing conflicts.

17 June 2026 · 13 min read

Done-for-you DMARC enforcement: how the managed path to p=reject works

Reaching p=reject is not the hard part. Anyone can change one DNS record from p=none to p=reject in thirty seconds. The hard part is reaching p=reject without silently dropping legitimate mail: the invoice from.

15 June 2026 · 17 min read

How to add DMARC, SPF and DKIM records on Gandi

A precise, Gandi-specific walkthrough for publishing DMARC, SPF and DKIM in the Gandi LiveDNS editor, covering the root vs host name convention, TXT quoting and chunking, CNAME trailing dots and TTL.

13 June 2026 · 21 min read

How to add DMARC, SPF and DKIM records on Google Cloud DNS

A precise, Google Cloud DNS-specific walkthrough for publishing TXT and CNAME records for DMARC, SPF and DKIM, including the gotchas that silently break authentication: public versus private managed zones, console versus gcloud TXT quoting, trailing dots on CNAME targets, 255-byte chunking and a TTL strategy for a safe staged rollout to p=reject.

9 June 2026 · 14 min read

Mailing lists, DMARC and ARC

Mailing lists are one of the few places where correct, well-behaved email authentication still breaks for reasons that are nobody's fault.

7 June 2026 · 14 min read

Amazon SES at scale: deliverability and DMARC

Amazon SES is deceptively easy to start with and deceptively hard to run well at volume. Verifying a domain, adding three DNS records and firing your first message takes an afternoon.

6 June 2026 · 16 min read

SendGrid dedicated IPs, authentication and reputation

Most teams reach for a SendGrid dedicated IP because someone told them shared IPs are bad, or because a deliverability vendor implied that owning your own IP is the professional thing to do.

24 May 2026 · 11 min read

One-click unsubscribe: the List-Unsubscribe requirement

Google, Yahoo and Microsoft now require working one-click unsubscribe on bulk mail. Here is what the List-Unsubscribe and List-Unsubscribe-Post headers are, how RFC 8058 one-click actually works on the wire, how to implement it correctly, and why it sits alongside SPF, DKIM and DMARC on the same deliverability checklist.

24 May 2026 · 12 min read

Double opt-in and why it matters

Confirmed (double) opt-in keeps spam-trap hits, bounces and complaints off your list, the exact reputation signals that decide whether your authenticated mail reaches the inbox and clears the Gmail and Yahoo bulk-sender rules.

20 May 2026 · 11 min read

Why Gmail, Yahoo and Microsoft now require DMARC

Gmail, Yahoo and Microsoft now require SPF, DKIM and DMARC from bulk senders. Here is what each demands, what "require" really means, and how to comply.

19 May 2026 · 12 min read

The 2024 and 2025 bulk-sender requirements in full

Google, Yahoo and Microsoft turned email authentication into a hard delivery gate. Here are the exact requirements, the numeric thresholds, who counts as a bulk sender, and a line-by-line compliance checklist.