Title: postday's Replies | WordPress.org

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# postday

  [  ](https://wordpress.org/support/users/postday/)

 *   [Profile](https://wordpress.org/support/users/postday/)
 *   [Topics Started](https://wordpress.org/support/users/postday/topics/)
 *   [Replies Created](https://wordpress.org/support/users/postday/replies/)
 *   [Reviews Written](https://wordpress.org/support/users/postday/reviews/)
 *   [Topics Replied To](https://wordpress.org/support/users/postday/replied-to/)
 *   [Engagements](https://wordpress.org/support/users/postday/engagements/)
 *   [Favorites](https://wordpress.org/support/users/postday/favorites/)

 Search replies:

## Forum Replies Created

Viewing 2 replies - 1 through 2 (of 2 total)

 *   Forum: [Plugins](https://wordpress.org/support/forum/plugins-and-hacks/)
    In
   reply to: [[WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin] Mail delivery failed – sign up register and authenticate](https://wordpress.org/support/topic/mail-delivery-failed-sign-up-register-and-authenticate/)
 *  Thread Starter [postday](https://wordpress.org/support/users/postday/)
 * (@postday)
 * [1 year, 10 months ago](https://wordpress.org/support/topic/mail-delivery-failed-sign-up-register-and-authenticate/#post-18060647)
 * Wonderful. Thank you. That has done it.
 *   Forum: [Plugins](https://wordpress.org/support/forum/plugins-and-hacks/)
    In
   reply to: [[WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin] Mail delivery failed – sign up register and authenticate](https://wordpress.org/support/topic/mail-delivery-failed-sign-up-register-and-authenticate/)
 *  Thread Starter [postday](https://wordpress.org/support/users/postday/)
 * (@postday)
 * [1 year, 10 months ago](https://wordpress.org/support/topic/mail-delivery-failed-sign-up-register-and-authenticate/#post-18045122)
 * I am now receiving a different mail delivery fail message after I speaking with
   the server:
 * > 
   > This message was created automatically by mail delivery software.
   > A message that you sent could not be delivered to one or more of its
   > recipients.
   > This is a permanent error. The following address(es) failed:
   >  [xxxxxxxx@gmail.com](https://wordpress.org/support/users/postday/replies/tristanhambleton@gmail.com?output_format=md)
   > 
   > host [gmail-smtp-in.l.google.com](http://gmail-smtp-in.l.google.com/) [173.194.76.26]
   > SMTP error from remote mail server after end of data:   550-5.7.26 Your email
   > has been blocked because the sender is unauthenticated.   550-5.7.26 Gmail 
   > requires all senders to authenticate with either SPF or DKIM.   550-5.7.26 
   > 550-5.7.26  Authentication results:   550-5.7.26  DKIM = did not pass   550-
   > 5.7.26  SPF [post.day] with ip: [91.109.115.123] = did not pass   550-5.7.26
   > 550-5.7.26  For instructions on setting up authentication, go to   550 5.7.26
   > [https://support.google.com/mail/answer/81126#authentication](https://support.google.com/mail/answer/81126#authentication)
   > ffacd0b85a97d-37cd56ead3fsi3463367f8f.905 – gsmtpReporting-MTA: dns; [lon16.onrocket.com](http://lon16.onrocket.com/)
   > Action: failed
   > Final-Recipient: rfc822;[xxxxxxx@gmail.com](https://wordpress.org/support/users/postday/replies/tristanhambleton@gmail.com?output_format=md)
   > Status: 5.0.0Remote-MTA: dns; [gmail-smtp-in.l.google.com](http://gmail-smtp-in.l.google.com/)
   > Diagnostic-Code: smtp; 550-5.7.26 Your email has been blocked because the sender
   > is unauthenticated.550-5.7.26 Gmail requires all senders to authenticate with
   > either SPF or DKIM.550-5.7.26550-5.7.26  Authentication results:550-5.7.26 
   > DKIM = did not pass550-5.7.26  SPF [post.day] with ip: [91.109.115.123] = did
   > not pass550-5.7.26550-5.7.26  For instructions on setting up authentication,
   > go to550 5.7.26  [https://support.google.com/mail/answer/81126#authentication](https://support.google.com/mail/answer/81126#authentication)
   > ffacd0b85a97d-37cd56ead3fsi3463367f8f.905 – gsmtp

Viewing 2 replies - 1 through 2 (of 2 total)