cold-email-deliverability-auditorlisted

Perfect personalization does not help from a domain that is not authenticated. Nothing in Anthropic's [sales plugin](https://github.com/anthropics/knowledge-work-plugins) touches the technical side of sending, and neither does most sales tooling — the sequencer sends what you give it and reports opens. This skill audits the layer underneath: the DNS records that prove you are you, the domain you send from, the list you send to, and the message itself. It works from text you paste, so it runs anywhere Claude does; pair it with [outreach-claim-checker](/skills/sales/outreach-claim-checker), which checks whether the email is true, once you know it will arrive. ## When to use this skill - You are about to start sending from a new domain or a new set of mailboxes. - Reply rates fell off a cliff and nothing about the copy changed. - Mail lands in Promotions or Spam for some recipients and Inbox for others. - You inherited a sending setup and have never seen its DNS records. - Your provider or a prospect's IT team bounced messages with a DMARC or SPF error you cannot read. - Before a volume increase, a domain migration, or moving cold outbound off the primary corporate domain. > [!NOTE] > This skill reads what you paste. It does not query DNS, log into a mailbox, or test-send. Ask your ESP or a DNS lookup for the raw records and paste them in. Every threshold below is a default this skill applies so its output is consistent; where your provider publishes its own numbers, say so a