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    Chapter · SPF for Postmark
    Revised 17 Jun 2026
    Guide · SPF · Postmark

    How to set up SPF for Postmark.

    Postmark is a transactional-only ESP with strict acceptable-use enforcement. Their authentication setup is the simplest of the major ESPs.

    Afsan Rahmatullah
    Afsan RahmatullahMailerMonk

    SPF (Sender Policy Framework, RFC 7208) authorizes specific servers to send mail for your domain. When you start sending through Postmark, you must publish a single SPF record at your domain apex that includes Postmark's sending infrastructure — otherwise the messages will fail SPF, your DMARC checks will fail, and your mail will land in spam or be rejected outright.

    If you already publish SPF for another sender (Google Workspace for inbound, a marketing tool, your CRM), do not publish a second record. Merge the new include into the existing record. RFC 7208 §3 forbids multiple SPF records on the same name and receivers MUST return permerror when they see one.

    Publish these DNS records

    Add the following record(s) to your domain's DNS zone. Most registrars (Cloudflare, Route 53, Namecheap, GoDaddy) accept values exactly as shown.

    Record · TXT
    Type
    TXT
    Host
    @
    Value
    v=spf1 a mx include:spf.mtasv.net ~all
    Why this matters
    • Postmark's docs include `a mx` mechanisms by default — these add 2 to your SPF lookup count. Drop them if you don't actually need apex A or MX records to pass SPF.

    Where in Postmark

    The SPF configuration lives in Postmark → Sender Signatures → Add Domain → DNS.

    Verify the records

    Once published, run the SPF Checker on your domain to verify the lookup chain expands cleanly and stays under the 10-DNS-lookup limit.

    From a terminal
    dig +short TXT your-domain.com
    Run the free SPF checker

    Common pitfalls

    Pitfall
    • Postmark's anti-spam team will pause your account if you send marketing mail through it. Use a separate ESP for newsletters or promotional content.
    • The Return-Path on Postmark mail is `pm.mtasv.net` by default. Set up a custom Return-Path domain for SPF alignment if you need DMARC to pass on SPF as well as DKIM.
    After you publish

    Want to know if it actually keeps working?

    MailerMonk continuously watches your SPF record, aggregate DMARC reports, and inbox placement — and pings you the moment something drifts. Free for the first domain.

    Start free trial

    About the author

    Afsan Rahmatullah
    Afsan Rahmatullah
    MailerMonk

    Building tools that keep cold email out of spam. Writes about deliverability, DMARC, and what actually moves inbox placement.

    Related · Postmark

    Other records for Postmark