The Postmark playbook

Postmark sends the receipts. Your domain still has to earn the inbox.

Postmark runs a managed warm-up for dedicated IPs, but most senders are on its shared pools, where there is no IP of yours to warm and a new sending domain starts with no history. Keep sending through Postmark exactly as you do now. Add your brand domain here and we build its reputation while Postmark keeps sending.

Start warming my domainSee guided DNS
The Postmark playbook

Keep sending from Postmark. Warm the domain here.

Step 1

Verify the domain and get the account approved

Postmark only sends from confirmed Sender Signatures or verified domains, and it reviews every account by hand. Until approval, you can send only to addresses on domains you have verified, plus Postmark’s test sink. Add the DKIM TXT record for each sending domain; Postmark calls DKIM on your domain the most critical factor.

Step 2

Add a custom Return-Path

Without one, bounces go to Postmark’s pm.mtasv.net, so SPF passes for Postmark but does not align with your From domain under DMARC. A CNAME such as pm-bounces.yourapp.com pointing to pm.mtasv.net brings SPF into line.

Step 3

Know what Postmark warms, and what it does not

On a dedicated IP, Postmark sets a firm daily limit, raises it automatically as reputation builds and sends the overflow through the shared pool. Dedicated IPs are reserved for high-volume Pro plans, and Postmark says most senders do best on its shared pools. There, the IP reputation is Postmark’s and the domain is the reputation you own. Postmark’s own advice is to ramp a new setup gradually rather than send a large volume at once.

Step 4

Add your brand domain to Inbox Boost

Use the domain in your From address, such as yourapp.com. The Return-Path subdomain Postmark uses, such as pm-bounces.yourapp.com, stays with Postmark. We set up what the domain needs and build its sender reputation for you. Nothing to connect to Postmark: no server token, no webhook, no change to your account. Keep sending through Postmark as you do now; mailbox providers score the domain in your From address, so the reputation built here counts for every Postmark send from yourapp.com.

Step 5

Check where Postmark mail lands

Inbox placement tests show whether your password resets and receipts reach the inbox or Spam across the major mailbox providers, and blacklist monitoring keeps watching the domain once it is warm.

  • Nothing to connect: no Postmark server token, webhook or integration
  • Nothing to change: your code, servers and message streams stay exactly as they are
  • Shared or dedicated IP: it works either way, because the reputation belongs to the domain
  • Watched after warmup: blacklist and authentication monitoring on your brand domain
Features Postmark senders lean on

The parts of the platform this plan leans on.

Feature

Inbox Boost

Add a domain. We provision the sending server and publish your DNS.

Learn more Feature

Guided DNS setup

We write SPF, DKIM and return-path into your zone, not you.

Learn more Feature

Inbox placement testing

See whether you land in Primary, Promotions or Spam across providers.

Learn more
See it play out

A Postmark domain, warmed without pausing a single send.

Four checkpoints, in order. Click any step or let it play.

postmark · yourapp.com
DKIM (TXT)verified
Return-Pathaligned
sending historynone yet
Questions

Postmark questions, answered.

Does Inbox Boost connect to my Postmark account?
No. There is no server token, webhook or integration to set up. Inbox Boost works on your brand domain, and Postmark keeps sending your application mail exactly as it does now.
Postmark already warms dedicated IPs. Why warm the domain too?
Postmark’s managed warm-up raises the daily limit on a dedicated IP as its reputation builds. Postmark itself says mailbox providers score both your domain and the IP, and a new sending domain starts with no history whichever IPs carry its mail.
I am on Postmark’s shared pools. Does this still help?
Yes. Most Postmark senders are, and Postmark recommends them for most people. The IP reputation there is Postmark’s, so the domain is the reputation that is actually yours. Building it here helps everything Postmark sends from it.
Does this replace Postmark’s account approval?
No. Postmark reviews every account itself, and Inbox Boost does not touch your Postmark account. Postmark also suggests keeping test sends off your production domain, using its test sink or a separate test server, so testing does not dent the domain’s reputation.
Can I see whether it is working?
Yes. Inbox placement tests show where your Postmark mail lands, inbox or Spam, across the major mailbox providers, and blacklist monitoring keeps watching the domain afterwards.
About the Postmark facts on this page

Checked against Postmark's own documentation on 12 October 2026. Postmark is a trademark of its owner; SenderSignal is not affiliated with it.

Other transactional & smtp: Amazon SES, Mailgun, SparkPost, Resend, Mailjet. All use cases.

Postmark keeps sending

Warm the domain behind your Postmark mail.

Start free, add your brand domain, and keep every message stream on Postmark while its reputation builds.

Start freeHow Inbox Boost works