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Less Secure App access: what replaced it, when it shut down, and what to do now
Google’s Less Secure App access ended: consumer Gmail 30 May 2022, Google Workspace 1 May 2025. The three replacements: OAuth, App Passwords, or switch provider.
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wp_mail Hooks Reference: Every Email WordPress Core Sends
Every email WordPress core sends and every wp_mail hook (wp_mail_failed, phpmailer_init, pre_wp_mail) with the filters that control each one.
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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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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.
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WordPress Email Queues: When You Need One and When You Don’t
wp_mail() sends email synchronously – every call blocks the PHP process until SMTP completes. A queue decouples sending from the page request. Here’s when that matters.
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How to set up Postman API platform as an OAuth client
Configuring Postman as an OAuth 2.0 client against Microsoft Graph or any IdP: redirect URI, PKCE, and token reuse details that trip up most setups.
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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.
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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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The SMTP Field Manual
The SMTP Field Manual catalogues real-world bounce messages from major mailbox providers and spam filters – the lookup step in WordPress bounce diagnosis.
The WordPress Email Authority