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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Recent Q&A’s
Recently Updated
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Best WordPress SMTP plugins: WP Mail SMTP vs FluentSMTP vs Post SMTP
WP Mail SMTP, FluentSMTP, and Post SMTP compared by use case. Free vs paid feature splits, where each plugin is the wrong choice, and the also-rans.
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Forward Email Forwarding and Hosting Service
Forward Email offers unlimited free forwarding and $3/month encrypted mailbox hosting. Source-available codebase. Generous free tier; modest sending limits.
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Free SMTP Servers for WordPress
SMTP providers with a $0 entry point that work for WordPress transactional email. What each free tier actually includes, and which ones are worth it.
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Elastic Email as a WordPress SMTP server
Elastic Email’s transactional API starts at $19/month for 50,000 emails. The Free plan includes SMTP and API access with a 3,000 emails/month cap and 100 emails/day limit. Competitive at volume, overpriced below 30K sends/month for WordPress.
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Gmail as a WordPress SMTP Server
Gmail can relay WordPress emails via SMTP using OAuth2 or App Passwords. Free accounts allow 500 sends/day; Workspace allows 2,000. Not a transactional service.
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Reading SMTP bounce codes in WordPress mailer logs
Decoding the SMTP bounce codes WP Mail SMTP, FluentSMTP, and Post SMTP log – numeric code, enhanced status code, and Gmail/M365 variations.
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Debugging WordPress SMTP OAuth setups with Postman
Validate a Microsoft 365 or Google Workspace OAuth registration in Postman before wiring the client ID and secret into WP Mail SMTP, FluentSMTP, or Post SMTP.
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Email service webhooks in WordPress: events, verification, retries
How ESP delivery-status webhooks work in WordPress: what Postmark, Mailgun, SendGrid, SES and Mailjet send, how to receive them, and how to verify them.
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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.
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WordPress.com vs WordPress.org Email: Who Owns the Sending Pipeline
On WordPress.com, Automattic owns wp_mail’s transport and the sending domain. On self-hosted WordPress.org, the operator owns both. Every email-behaviour difference between the two platforms follows from that.
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Every Email WordPress Core Sends: the wp_mail catalog
The catalog of transactional emails WordPress core sends — comments, password resets, GDPR, updates, recovery mode — with trigger, default recipients, and the filters that control each one.
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Less Secure App access: what replaced it, when it shut down, and what to do now
Google shut down Less Secure App access — consumer Gmail May 2022, Workspace May 2025. The three replacements (OAuth, App Password, switch provider) and which fits which WordPress use case.