The basic mailer name and sender details render from the free version, which stores everything in the wp_mail_smtp option. The deliverability badge variant needs Pro because the wpms_emails log table only exists in Pro. If you do not need the live number the free version is enough to bind brand and sender.

Changing the mailer triggers an update_option call on wp_mail_smtp, which SleekPixel listens for via the updated_option hook. Every cached OG image bound to the WP Mail SMTP template is invalidated, and the next request to each post regenerates the PNG with the new mailer name in the brand slot.

Yes. Add a per-post override via a custom field named sleekpixel_mailer with a value like postmark or sendinblue. The template prefers the override when set, which is useful for legacy tutorial posts that document a provider you no longer use but still want to read accurately.

The template runs a saved SQL fragment against the wpms_emails log table over a rolling window you configure, defaulting to the last seven days. Status equals delivered divided by total minus status equals failed, returned as a percentage with one decimal. The number caches alongside the PNG.

Use the per-post mailer override so the card pins to the documented provider. Without an override the brand slot reads the live mailer, which can be confusing on an archived tutorial. The override is a single custom field, no template fork needed.

By default the from_email field renders truncated as the local part plus the domain, like marketing at acme.co, which avoids scraper friendly mailto strings. You can disable email rendering entirely from the template settings, replacing it with the site name or the active mailer brand.

First render takes around 350 to 600 milliseconds on a typical Kinsta or WP Engine host because the template reads only two option rows and a single log aggregate. Subsequent requests are static file serves at well under 50 milliseconds, since the PNG sits in the uploads directory.

Yes, routing rules are stored in the same wp_mail_smtp option array. The template can reference the rule that matches a given post category, useful when marketing posts send through one mailer and engineering posts send through another. The brand slot then reflects the rule, not just the global default.