How it works
The four records, what a catch-all address means, and how to pick local parts. Read the overview
Reply Domain Guides
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A reply domain is a subdomain you point at Know Reply, for example reply.yourbrand.com. You add four DNS records once, then set an address on that subdomain as the Reply-To in whatever you send with. Every reply lands in Know Reply and gets answered.
There is no mailbox to connect, no app password, and no OAuth consent screen. Start with the overview, add the DNS records at your registrar, then set Reply-To in each sending platform you use.
Add the DNS records
Field-by-field instructions for Cloudflare, GoDaddy, Namecheap, Squarespace, Hostinger, and Route 53. Pick your registrar
ESP Reply-To guides
Section titled “ESP Reply-To guides”Each guide covers where the Reply-To field lives, what to paste, and whether campaign email and transactional email are set in different places.
Klaviyo
Mailchimp
Omnisend
Shopify Email
Brevo
ActiveCampaign
Drip
SendGrid Marketing Campaigns
HubSpot
DNS provider guides
Section titled “DNS provider guides”Same four records everywhere. The field names and the way each provider treats the host differ, which is where most setups go wrong.
Cloudflare
Proxy must be off for the CNAMEs. Cloudflare guide
GoDaddy
Namecheap
MX lives under Mail Settings. Namecheap guide
Squarespace
Formerly Google Domains. Squarespace guide
Hostinger
Amazon Route 53
If your provider is not listed
Section titled “If your provider is not listed”Every DNS host takes the same four records. Copy the values from the domain screen in Know Reply, add one MX and three CNAMEs, and check whether the host field wants the full name (s1._domainkey.reply.yourbrand.com) or the part in front of your domain (s1._domainkey.reply). The overview explains how to tell.