nanoPost

The WordPress Email Authority

FREE expert advice on setup, maintenance, and troubleshooting

Your WordPress email problems solved

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

    • Contact Form 7 review

      Contact Form 7 uses wp_mail(), so any mailer plugin routes its submissions automatically. Free, no Pro tier, add-ons fill the rest.

    • Zeptomail (by Zoho) as a WordPress SMTP Server

      Zeptomail is Zoho’s transactional-only email relay. Credit-based pricing at $2.50/10K emails with no monthly fee. Best for sites already using Zoho.

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

      Netcore Email API (formerly Pepipost) is an enterprise-focused relay. Netcore has retired the public pricing page; paid tiers are sales-gated. Free tier allows 100 emails/day. Most WordPress sites should use simpler alternatives.

    • 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.

    • Amazon SES as a WordPress SMTP Server

      Amazon SES sends email at $0.10 per thousand – the cheapest in this category. The trade-off: IAM credentials, sandbox restrictions, no permanent free tier.

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

      SparkPost operates as Bird’s email product after the 2022 acquisition. Self-service Starter ($20/mo) and Premier ($75/mo, dedicated IP included) tiers are back; Enterprise handles 5M+/mo. The official WordPress plugin remains closed as of March 2025.

    • Microsoft 365 as a WordPress SMTP Server

      Microsoft 365 can relay WordPress mail through Exchange Online via SMTP AUTH or OAuth. Per-mailbox cap is 10,000 recipients per day, 30 messages per minute. SMTP AUTH Basic Authentication is default-off on existing tenants from the end of December 2026; OAuth is the only path that survives the cutoff.

    • Transactional email and WordPress

      Transactional email goes to one recipient following one action they initiated. Here is what WordPress core and WooCommerce send, and how the legal carve-out works.

    • How Email Works: A WordPress Operator’s Reference

      The five-stage delivery chain from wp_mail() to inbox, what the operator controls, and how SPF, DKIM, and DMARC work as a system.

    • The WordPress email FAQ

      Answers to common WordPress email questions covering configuration, deliverability, authentication, and the tools involved.

    • WordPress.com vs WordPress.org Email: Who Owns the Sending Pipeline

      On WordPress.com, Automattic owns the sending pipeline and domain. On WordPress.org, the operator does. Every email behaviour difference follows from that.