Free WordPress email tools: SPF, DKIM, DMARC, and more.

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nanoPost

The WordPress Email Authority

FREE expert advice on setup, maintenance, and troubleshooting

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Welcome to nanoPost, or, as we’d like to think of ourselves, The WordPress Email Authority. Our mission is to help you solve your WordPress email problems, whether it’s setting up, maintaining, or troubleshooting. Our expert guides, Q&A, reviews, and news on WordPress SMTP, contact forms, and more are here to provide you make the best choices.

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    Recently Updated

    • ARC for forwarded WordPress mail: what the chain is and who trusts it

      ARC is the forwarder’s cryptographically signed record of what pre-forward authentication looked like. A receiver that trusts the forwarder can accept its attestation that SPF and DKIM passed before the hop, even when the current authentication state has broken on the forward.

    • SRS for forwarded WordPress mail: what the scheme does and where it stops

      SRS rewrites the envelope sender during a forwarding hop so SPF realigns at the destination against the forwarder’s own domain. For WordPress operators, it is the fix that keeps forwarded inbound mail from silently failing when the original sender publishes a strict DMARC policy.

    • DKIM for WordPress email: how the signature works and how it fails

      DKIM is the cryptographic signature a sending server attaches to each outgoing message, verifiable against a public key published in DNS. For WordPress operators, it is the authentication method that survives forwarding and the one that carries DMARC alignment through most relay configurations.

    • Netcore Email API (formerly Pepipost) as a WordPress SMTP Server

      Netcore Email API (formerly Pepipost) is an enterprise-focused relay. Pricing shifted to Growth and Enterprise tiers on the Customer Engagement Platform, billed by Monthly Tracked Users (Growth from ₹12,000/mo for 5,000 MTUs, channel delivery separate). Free tier allows 100 emails/day. Most WordPress sites should use simpler alternatives.

    • FastComet

      FastComet (WHG-owned since April 2025) tiers mailboxes 5/25/Unlimited/Unlimited and runs outbound through SpamExperts. SMTP open; no published sending limit.

    • Cloudways

      Cloudways provides no bundled email. Port 25 blocked; wp_mail() fails by default. Email requires the Elastic Email addon, Custom SMTP addon, or a WordPress SMTP plugin.

    • SiteGround

      SiteGround bundles full domain email and signs WordPress mail with an auto-published DKIM. Hourly caps: 400 (entry plans), 800 (GoGeek and Cloud).

    • Mail Queue WordPress plugin review

      Mail Queue by WDM queues WordPress email via the pre_wp_mail hook, leaving SMTP plugins untouched. Actively maintained: v1.6.1, tested up to WordPress 7.0.

    • addy.io Email Aliasing Service

      addy.io (formerly AnonAddy) is an independent, open-source email aliasing service. Unlimited standard aliases on custom domains from $3/month on the Pro tier.

    • Bird (formerly MessageBird, formerly SparkPost) as a WordPress SMTP server

      SparkPost operates as Bird’s email product after the 2022 acquisition. Self-service Startup (from $15/mo for 50K) and Growth (from $80/mo for 100K) tiers; dedicated IP is a $24.95/mo add-on on Growth and above. The official WordPress plugin remains closed as of March 2025.

    • SendGrid as a WordPress SMTP server

      SendGrid is a high-volume email platform owned by Twilio. Essentials plan starts at $19.95/month for 50,000 emails. Priced and featured above what most WordPress sites need, but a defensible choice at enterprise scale.

    • Postmark as a WordPress SMTP Server

      Postmark review, for WordPress: pricing from $15/mo for 10,000, stream separation, WP Mail SMTP setup. The right transactional default.