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verification failed error fix
For the "callback verifier" software once commonly used by dial-up bulletin board systems, see Callback (telecommunications)#Modem security.Callback verification, also known as callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses. The most common target of verification is the sender address from the message envelope (the address specified during the SMTP dialogue as "MAIL FROM"). It is mostly used as an anti-spam measure.