Event Id1708
SourceMSExchangeTransport
DescriptionSMTP Authentication was performed successfully with client remote_computername. The authentication method was LOGIN and the username was company\username.
Event InformationAccording to Microsoft :

RESOLUTION

In this case, if the relaying appears to come from a hacked account password, go to the Active Directory Users and Computers snap-in and delete the account, disable the account, or change the password on the account.
Microsoft recommends that you implement a strong password policy.
Reference LinksHow to block open SMTP relaying and clean up Exchange Server SMTP queues in Windows Small Business Server


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