This error occurs because Yahoo cannot verify that the email arrived from a legitimate sender. To avoid such situations Yahoo recommends using the following technologies:

  • SPF (Sender Policy Framework)
  • DKIM (Domain-Keys Identified Mail)
  • DMARC (Domain-based Message Authentication, Reporting and Conformance)
Hai trovato utile questa risposta? 4 Utenti hanno trovato utile questa risposta (52 Voti)

Gli articoli più popolari

"451 Please try again later" when sending emails from Outlook

When you try to send emails from Outlook, you receive the following message: An unknown error...
"Error 0x800CCC78" when sending emails

When you try to send emails, the following message will be returned to you: Sending' reported...
"Error 0x800ccc0d or 0x800ccc0f" when sending or receiving emails

When trying to send/receive emails you receive one of the following messages: The server could...
"Message Could Not Be Retrieved" or "Server Error: 0x800CCC90, Error Number: 0x800420CD"

This problem originates from the inability of Outlook to download a particular email from the...
"too many attachments" when sending an email

In the shared hosting environment, the maximum number of attachments that can be sent in an email...