Event ID - 1025

Event Id1025
DescriptionSMTP rejected a (%4) mail from '%1' with '%2' connector and the user authenticated as '%3'. The Active Directory lookup for the sender address returned validation errors. %5
Event InformationAccording to Microsoft :
Cause :
This Error event indicates a problem validating the e-mail address of a sender that was using "Send as" permission to send a message. The Active Directory directory service lookup for the sender's address returned the specified validation errors.
The "Send as" permission allows recipients to send e-mail messages as if the message originated from a different recipient. Specifically, recipients who are granted the "Send as" permission to any mail-enabled object can enter the other recipient's name in the From field for the messages that they send.
Resolution :
To resolve this error, do one or more of the following:
1.Make sure that the Exchange server that logged this event can communicate with one or more Active Directory servers available in the organization.
2.Verified that the specified recipient has the "Send as" permission granted to the specified mail-enabled object.
Reference LinksEvent ID 1025 From Source MSExchangeTransport

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