Gmail and Yahoo require SPF, DKIM, and Dmarc protocols for all bulk senders by April 2024.



Gmail and Yahoo require SPF, DKIM, and Dmarc protocols for all bulk senders by April 2024.


Most of Service2Client's email users are not bulk senders; nonetheless, these changes might affect your email delivery.


Reason for this Notice

The SPF, DKIM, and Dmarc protocols have been working together to block spammers and spoofers for 12 years (SPF for 24 years). Service2Client has been using these protocols to secure our client's email since 2008. The problem is that many email providers have not adopted these protocols until now or have misconfigured them.


Things that can cause delivery problems.


  • Misconfigured SPF, DKIM, or Dmarc on the senders' or receivers' side. The larger the company, the more complex this issue gets.
  • Sending emails from third-party email clients. (Currently, if your employer allows you to work from home but you don't have Outlook, you could set up your employer's email in a third-party web email client like AOL. If that employer turns on Dmarc, your email sent from AOL will start bouncing.)
  • Forwarding from a business email to free services like Gmail or Yahoo mail. (People forward business emails to free mail services because it is more convenient and adds a second layer of spam filter. Many of these forwarded emails will stop working as more and more companies start turning on Dmarc) 


What you should do

In the next six months, we recommend that Outlook Desktop POP3 users regularly log in to Webmail at and check their Junk folder for legitimate emails. You can Move or Drag them into the Inbox and Mark them as a Trust Sender, but if they fail Dmarc, they will go to the Junk folder regardless of being a Trusted Sender.


Outlook Desktop IMAP and MAPI users should regularly check their Junk folders.


Webmail user should regularly check their Junk folder. 


When you find a legitimate email that regularly goes to your junk folder, do the following: 

  • Please reply to the email and let the email account owner know that something is wrong with their SPF, DKIM, and Dmarc settings and that they need help from their Email Administrator.
  • Create an Email Content Filter in Smartermail to get the email into your Inbox.
    • In Webmail, go to Settings/Content Filtering/New/Namexxxx/ANY condition must be met/New Condition/From Emailxxxxxx/Action/New Action/Move message/Inbox.


How to Create a Content Filter


In the video above, only use Wildcard * entries for business domains. Never add an entry like * This will send all the Gmail Spam to your Inbox.