Fires an action hook right after the email(s) have been sent.
grunion_after_message_sent
grunion_after_message_sent-
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filter jetpack_video_sitemap_default_thumbnailFilter the thumbnail image used in the video sitemap for non-VideoPress videos.
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action jetpack_sync_import_startUsed for syncing the start of an import
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action jetpack_wp_loginFires when a user is logged into a site.
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filter jetpack_sync_known_importersFilter the list of known importers.
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filter jetpack_json_manage_api_enabledFilter to disallow JSON API requests to the site. Setting to false disallows you to manage your site remotely from WordPress.com and disallows plugin auto-updates.
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filter jetpack_password_checker_testsFilters Jetpack’s password strength enforcement settings. You can determine the tests run and their order based on whatever criteria you wish to specify.
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filter jetpack_password_checker_minimum_entropy_bitsFilters Jetpack’s password strength enforcement settings. You can modify the minimum entropy bits requirement using this filter.
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filter jetpack_password_checker_restricted_stringsFilters Jetpack’s password strength enforcement settings. You can supply your own passwords that should not be used for authenticating in addition to weak and easy to guess strings for each user. For example, you can add passwords from known password databases to avoid compromised password usage.
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filter wp_update_php_urlFilters the URL to learn more about updating the PHP version the site is running on.Providing an empty string is not allowed and will result in the default URL being used. Furthermore the page the URL links to should preferably be localized in the site language.
Jetpack Developer Resources 