Shulou(Shulou.com)06/03 Report--

550 5.7.60 SMTP; Client does not have permissions to send as this sender

Today, a user mailbox suddenly can receive mail, can not send mail!! Baidu searched for a long time did not find, Google found a solution to share

The Active Directory Service has a process to ensure that the security identifiers of protected groups are not altered. If the security identifier of an account belonging to a protected group does not match the security identifier of AdminSDHolder Object, the security identifier of the account is overwritten by the security identifier of AdminSDHolder Object.

Because the Send As permission is modified by modifying the user's security identifier, if a user belongs to a protected group, the above modification will be executed in about one hour, that is, the security identifier of AdminSDHolder Object will be overwritten to the user's security identifier. Because Send As belongs to one of the permissions of the security identifier, it will also be overwritten at the same time, resulting in the loss of NT Authority\Self permission.

Open Exchange Management Shell

Solution: Increase Send-as permissions for all users

Add additional send as permission to mailbox users: Get-Mailbox| Add-ADPermission -User 'NT Authority\Self' -ExtendedRights 'Send-as'

Add Send-as permission to the user mailbox in question ('****'is the user mailbox account)

Get-Mailbox "****" | Add-ADPermission -User '****' -ExtendedRights 'Send-as'

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