Custom Plugin – Blacklist/Whitelist domain email and change user role – Suggestions

I’d suggest you process all users once (using a WP-CLI command if your db is big and response timeout is a possible risk) and then check a user each time they try to change their email (using wp_update_user filter – https://developer.wordpress.org/reference/functions/wp_update_user/).

Related Posts:

  1. How to get role of user
  2. How do I programmatically set default role for new users?
  3. What do unfiltered_html and unfiltered_upload actually filter?
  4. Temporary capability for current_user_can()
  5. How to update role capabilities
  6. How to loop through each user id?
  7. Code needed to only show users own posts in a multi-user account
  8. Ordering users of a specific role by last name
  9. Restrict Author to pick from media library, but not upload media
  10. how to add custom user capabilities using add_user_meta or something else?
  11. Remove Ability for Administrators to Delete Administrators
  12. Order users by custom user meta
  13. List total number of users that are authors
  14. I need to assign a role to visitors/guests
  15. Auto Delete Users (auto_delete_users)
  16. New Roles and Capabilities in WordPress
  17. WordPress Super Admin
  18. How are roles stored in the database?
  19. How to get all users with Author role capabilities?
  20. How to ‘unpublish’ or ‘hide’ posts when user role changes?
  21. Can’t manage to make translate_user_role() work
  22. Add Role inherits?
  23. similar to Editor can create any new user except administrator
  24. How to check if a role has a specific capability
  25. Expire a user’s secondary role after X days from it being allocated
  26. How to Orderby User Role?
  27. Can a user with admin role get ‘Sorry, you are not allowed to move this item to the Trash’ error when trashing a post?
  28. Making shortcode of filtered number of comments by user role
  29. How to stop contributors editing post type but allowing them to edit a custom post type?
  30. The delete_posts capability?
  31. Allow Block Editing By User Role
  32. WordPress missing user roles on local dev machine. Live site works fine
  33. Programmatically allow a non-author to edit a post based custom meta field
  34. Customizer – Allow user editor to change website title and tagline
  35. Query users which have same dynamically generated roles as the current user
  36. change role of wordpress users when they edit profile
  37. Change post status based on user role
  38. Display User Role Next To Comment
  39. Pending status by default for a specific role
  40. Getting a role based on a localized role name
  41. Allow an editor to change the author
  42. How do I restrict user access to plugins?
  43. Admin User Role Unable to See Private Posts
  44. New user is assigned 2 roles: customer and superadmin
  45. How to give remove role editing permission from user
  46. Allowing user to edit posts based on the post status
  47. How to have kind of a technical writer role in wp website
  48. Assigning certain authors to specific editors
  49. Undo User Role Name Change
  50. add_role user capability not working
  51. How to make the Newsletter plugin visible to users with author privileges?
  52. WP welcome email depending on user role
  53. Purpose of Adding Capability to Role But Not Grant?
  54. bbPress: How to set conditional for specific user -or- user role, to be displayed in user profile
  55. Limit a user to have access to only specified pages?
  56. How can I promote a user to a network administrator?
  57. read_private_pages capability not working for new role
  58. Updater user with multiple roles
  59. Custom user types getting html sanitized in posts
  60. Restrict custom post content to specific user
  61. Hiding custom theme functionality using capabilities
  62. Use PHP code to create custom user roles. Call it once?
  63. How can I programattically hide all admin notices for everyone except admin users
  64. custom plugin not visible to some user roles
  65. How to exclude subscriber from the list in wordpress
  66. What Capability is required to let a role RUN code in Edit Theme?
  67. Create sub-administrator role that can do everything except use or see the code editor
  68. remove_cap nothing changes
  69. display user roles in comment form
  70. Is it proper to build a site supporting blog visitors in WordPress?
  71. Removing capabilities from cloned admin role
  72. Retrieve user roles but exclude default roles
  73. Setting an expiration date for wordpress roles
  74. Could we know who published a post on WordPress?
  75. Disabled delete_others_posts if post is from admin
  76. Auto Change WordPress Roles
  77. How to hide Add new Term area for taxonomy terms for specific role (Client)
  78. Separate user bases or hide users of another role or connected to another minisite
  79. Saving user meta “member_id” based on user role
  80. Change logo url based on WP user role
  81. show the author’s role along with the name in the single.php
  82. Display specific post categories to specific user roles
  83. Role and Capabilities: How do I allow user role to access theme options without enabling ‘manage_options’?
  84. How to Enable registration email for a custom user role?
  85. How can I add the ability for a user to add/edit administrators?
  86. Allow signed in users (subscribers) to see their drafts
  87. How to sync user database with “user role editor” plugin enabled
  88. add user role selection to registration form [duplicate]
  89. Need to create admin user without capability to create user
  90. Assign specific editor with custom user meta “A” to all authors with custom user meta “A” and exclude all other author access
  91. Grant access to admin menu?
  92. Give editor ability to edit custom settings without access to Main Settings
  93. I want this code to work only for Authors AND Contributors
  94. How to assign role to a custom registration form?
  95. Disable Woocommerce checkout based on user role [closed]
  96. Remove_role not working, gives “Call to undefined method stdClass::remove_role()”
  97. Adding a new role with administrator’s capabilities
  98. Get users by rôle in a list
  99. Role Scoper, don’t allow other users to see pending posts
  100. WordPress show content if current user get spesific role and spesific meta value