Mailyard – WP SMTP Plugin with Email Failover, Email Log, Amazon SES, Postmark, Resend & Brevo

Mailyard is a WordPress SMTP plugin with a backup plan. Connect Amazon SES, Postmark, Resend, Brevo, or any SMTP server, and every email your site sends — password resets, WooCommerce receipts, form notifications — goes through a real email service instead of your host’s mail server. And if that service fails, Mailyard switches to your backup on the same send, so the email still goes out.

Out of the box, WordPress hands wp_mail() to your web host, and most hosts are bad at email: messages get blocked, land in spam, or vanish without a trace. That’s why «WordPress not sending emails» is one of the most common problems on any support forum. Mailyard fixes it — and keeps it fixed when your provider has a bad day.

Everything you see is free. No locked buttons, no crippled features, no upgrade nags.

What you get

• Automatic email failover — a backup provider takes over the moment the first one fails
• Six ways to send — Amazon SES, Postmark, Resend, Brevo, custom SMTP, or PHP mail
• Smart sender routing — the right provider for each kind of mail, automatically
• Full email log — every send and every failure, with the exact error
• Deliverability checker — grades your SPF, DKIM, DMARC & MX records and hands you the fix
• Bounce & complaint tracking — one clean hook for all four provider webhooks
• AI agent tools (MCP) — let Claude, Cursor, or Codex diagnose your email problems
• 60-second setup — pick a provider, paste a key, send a test

Automatic email failover

Add a backup provider and Mailyard switches to it the moment your first one fails — on the same send, not in a retry queue. A flaky API key on a Saturday night stops being your problem. Most SMTP plugins just give up and log the failure; SMTP failover is the reason Mailyard exists.

Smart sender routing

Send store receipts through Postmark and newsletters through Brevo, automatically, based on the from address. One site, the right provider for each kind of mail. You can also split by purpose — transactional email one way, marketing the other.

Full email log

Every email your site sends is logged — recipient, subject, status, and the exact provider error when something fails — so «did the order confirmation go out?» takes ten seconds to answer, not an afternoon of digging through server logs. Logs clean themselves up after 30 days, and you can switch email logging off entirely.

Deliverability checker (SPF, DKIM, DMARC & MX)

Reads your sending domain’s SPF, DKIM, DMARC, and MX records, grades them A–F, and tells you exactly which DNS record to add. That missing record is usually the reason email lands in spam — and most people never find out.

Bounce and complaint tracking

When an address hard-bounces or someone hits «mark as spam», Postmark, Amazon SES, Resend, and Brevo report it back. Mailyard catches those events, tidies them into one shape, and fires a single mailyard_bounce hook your other plugins can act on — so bad addresses get caught instead of quietly wrecking your sender reputation.

AI agents (MCP)

WordPress 7.0 shipped the Abilities API — the layer that lets AI tools operate your site. Mailyard is built on it from day one, so Claude, Codex, Cursor — any MCP client — can answer «why aren’t my WooCommerce emails arriving?» for you: check the provider and fallback chain, score your SPF/DKIM/DMARC records (with the exact DNS lines to add), read the failure log, and send a test once it’s fixed.

You decide what it may touch. Settings → Connect AI has a master switch and a per-tool permission for each of the five tools, with a step-by-step guide to connecting your client. Nothing is exposed until you install an MCP bridge (the free WordPress MCP Adapter plugin), and Mailyard never sends your data anywhere on its own. Needs WordPress 7.0 — the current release.

60-second setup

Pick a provider, paste your API key, set the address you send from. That’s the whole thing. No code, no config files. Mailyard also warns you if another SMTP plugin is fighting you, and one-click test sends tell you immediately that mail is flowing.

Providers you can use

• Resend — easiest to start with.
• Brevo (was Sendinblue) — all-in-one email platform.
• Postmark — best inbox placement, made for stores.
• Amazon SES — cheapest at high volume.
• Custom SMTP — any SMTP server or relay, Gmail app passwords included.
• Default PHP mail — your host’s server. No setup, but don’t count on it.

Mailyard Pro

If you also want to send campaigns — broadcast email, contacts, and automations — that’s a separate paid plugin, Mailyard Pro, which uses Mailyard as its delivery engine. Mailyard itself never nags you about it, and nothing in this plugin is held back for it.

Who’s behind this

One person — Fahim, in Dhaka, building WordPress plugins since 2011. DiviPeople and DiviTorque come from the same desk and run on 170,000+ sites. When you post in the support forum, the developer answers; there’s no tier-1 script to get past.

Source code

The admin screens are React, built with @wordpress/scripts. The unminified source lives at https://github.com/plugpressco/mailyard under src/. To build it yourself: npm install, then npm run build.

Privacy

Mailyard only talks to the email service you set up. It doesn’t phone home and it doesn’t track you.

The deliverability checker reads your domain’s DNS records. It uses your server’s resolver first, and only if that fails does it fall back to Cloudflare’s public DNS (cloudflare-dns.com) — which sees the domain name and nothing more.

If logging is on (it is by default), each email’s recipient, subject, and body get saved to your database. Turn it off in Settings whenever you want.

External services

Mailyard sends your WordPress email through a third-party email service that you choose and set up with your own account and API key. Nothing is sent anywhere until you pick a provider and enter its credentials, and then it only goes to that one provider (plus its fallback, if you added one).

What gets sent is the email your site is already trying to send: the recipient address(es), the sender, the subject, the body, and any attachments. It’s sent at the moment WordPress sends that email — a password reset, a WooCommerce order, a contact-form reply, and so on.

Resend — email delivery API, used if you pick Resend. Each email goes to https://api.resend.com/emails. Terms: https://resend.com/legal/terms-of-service — Privacy: https://resend.com/legal/privacy-policy

Brevo (formerly Sendinblue) — email delivery API, used if you pick Brevo. Each email goes to https://api.brevo.com/v3/smtp/email. Terms: https://www.brevo.com/legal/termsofuse/ — Privacy: https://www.brevo.com/legal/privacypolicy/

Postmark — email delivery API, used if you pick Postmark. Each email goes to https://api.postmarkapp.com/email. Terms: https://postmarkapp.com/terms-of-service — Privacy: https://postmarkapp.com/privacy-policy

Amazon SES (Simple Email Service) — Amazon’s email delivery API, used if you pick Amazon SES. Each email goes to https://email.{your-region}.amazonaws.com/v2/email/outbound-emails. If you turn on bounce/complaint webhooks for SES, Mailyard also confirms the Amazon SNS subscription with a one-time request to the AWS-hosted SubscribeURL (it checks the host is on amazonaws.com first). Terms: https://aws.amazon.com/service-terms/ — Privacy: https://aws.amazon.com/privacy/

Custom SMTP — if you pick the Custom SMTP option, email goes to the SMTP host and port you enter. That’s whatever SMTP service or server you choose, so check its own terms and privacy policy.

Cloudflare DNS over HTTPS — only used by the deliverability checker, and only as a fallback when your server’s own DNS lookup fails. It sends just your domain name (to read SPF/DKIM/DMARC/MX records) to https://cloudflare-dns.com/dns-query. No email content is involved. Terms: https://www.cloudflare.com/website-terms/ — Privacy: https://developers.cloudflare.com/1.1.1.1/privacy/public-dns-resolver/