Simple spam check for valid domain in commenter’s email address

The problem is not if it exists, after all I can sign up with [email protected] , it’s fake and the domain obviously exists.

The only real way to verify is to send an email to the address and have an action that they click.

Related Posts:

  1. Get comments for more than one post
  2. Add placeholder attribute to comment form fields
  3. human_time_diff() returns “48 years ago” for all comments
  4. “Categories” for comments?
  5. Allow anonymous comments, but prevent spam [closed]
  6. Where to remove from comment’s feed?
  7. Why are default comments deprecated?
  8. Comments Reply Form
  9. Allow guests comments on single post
  10. Delete all user comments
  11. Why do I get email notifications about comments that WordPress has already determined are spam?
  12. Delayed commenting
  13. “Leave a comment” link even when you can’t
  14. An action hook where a comment meta is updated
  15. Display number of comment replies
  16. User can post only one comment per day on one page
  17. Last comment page first with full number of comments?
  18. Only subscriber role user can comment not other
  19. customize comment form
  20. How to check if commenter is the_author?
  21. Relaxing unescaped HTML filtering inside tags?
  22. How to get the result of comments_number() as a string instead of printing it out?
  23. Should I still worry about paginated comments with the latest wordpress versions?
  24. WordPress unresponsive after calling wp_update_comment()
  25. How to dont allow registered users to comment without being logged in?
  26. edit comments capability for authors
  27. Publish a message on facebook after having posted a comment
  28. Users with custom roles can’t read each other’s comments
  29. Why is_wp_error() is not returning false even there’s no defined error
  30. wp_insert_comment and security
  31. How can someone submit a comment when my site has no comment field?
  32. Separete trackbacks/pings and numbered comments
  33. How can I fix wp_insert_comment failure when ‘comment_content” includes slanted apostrophe in Excel csv source data
  34. Show comments in a popup
  35. Is WordPress vulnerable to “comment posting forgery”?
  36. How to display html in only the first level of WP comments?
  37. Set noindex page-comment from Pages 2, 3 and More?
  38. How can I convert anonymous commenters into registered users?
  39. How can I edit comment notification email content?
  40. your comment awaiting moderation message sometimes not appearing
  41. Limit comments per user per post
  42. Filter In Reply comments from WordPress Admin Panel
  43. blank page after submitting a comment
  44. Remove post navigation links
  45. How to automatically evaluate comment content without user seeing the delay?
  46. Notify post author for a new comment on his post?
  47. css hide all the comment reply links except the lowest nested comments
  48. Spammers attacking my WordPress Site – Removing URL field from core? [closed]
  49. Which filter/hook to use for styling comments?
  50. How should I get the original comment while processing the reply
  51. I wish to remove, disable or hide the comment authors’ links to their sites from my home page
  52. Admin can enter JavaScript – potential security risk?
  53. custom hooks before a comment is updated/edited in the database
  54. How to stop ultimate members to redirect comment authors to user profile?
  55. Replace comments with a dummy text
  56. How do I stop the comments going to my email?
  57. Disable only the comment form/box itself?
  58. How to implement just the wp commenting area on my custom site?
  59. anyone can help me to know whats going wrong? [closed]
  60. How to hide wordpress post comment form for specific role
  61. How to display comment meta under each comment content
  62. Why there is still an approved comment after deleting all?
  63. Get comment id of the individual comments in comment list when modifying comment posted using comment text filter
  64. Custom comment field not showing when logged-in
  65. get_comment_meta not behaving as expected
  66. get_comment_author_link not working properly
  67. How do I get a array, with the right order of the nested comments?
  68. disable reply comments on depth equals 2
  69. Problem with comment box
  70. Page comes up blank using w3 total cache [closed]
  71. Comment Table Size Results in Slow Page Loads and 500 Errors
  72. Insert ads between comments
  73. get_query_var(‘paged’) for WP_Comment_Query always return 1 when using paginate_comments_links()
  74. How to only show current user’s comments and comments on current user’s posts in wp admin
  75. How to make author comment name to “Editorial Staff” no matter which ever author is replying to comments from his/her account?
  76. How to show username in reply to comment?
  77. Custom sort comments with select form
  78. Display date and time into post edit comments section
  79. Disallowed Tag Present in AMP WordPress ()
  80. Limit Comment Line Count – Add Read More Button
  81. Comments/Discussion Not enabled on newly created posts/pages
  82. Fire Social Annex Code on Comment Approval
  83. Displaying comment rating stars in carousel
  84. Enable comments option
  85. Change Comment Text [duplicate]
  86. Comments closed but enabled on edit screen
  87. Let user delete comment on front end only
  88. jQuery to Create Button to Show/Hide WordPress Comments and to Hide Comments by Default
  89. Comment form – different title if no comment yet
  90. WordPress Comments jQuery Doesn’t submit
  91. Auto approve all comments (editor)
  92. add field comment [duplicate]
  93. Let users comment on categories in WordPress
  94. Loop not displaying comments_popup_link
  95. Display of comment_date within get_comments?
  96. How to batch convert comments to posts?
  97. prevent duplicate comments using wp_insert_comment
  98. I need help about wordpress of members section
  99. comment_approved custom value
  100. TinyMCE in comment reply form showing toolbar but can’t edit reply
error code: 523