Hi ,

Anyone please help for this error, For Exchange Server 2013.

550 5.7.1 Client does not have permissions to send as this sender

You haven't described your scenario, so I'm guessing but.....

You probably gave someone full mailbox permissions to another mailbox and thought that this would be sufficient to allow them to read the mailbox content and send. However, Send As permissions are separate and need to be set manually (as mentioned by MatijaFX).

This link has instructions: https://technet.microsoft.com/en-us/library/JJ919240%28v=EXCHG.150%29.aspx

Alternatively, if you assigned Send As permission and it's not working, there is often a lag between assigning the permissions and Exchange realizing the permissions have been updated. Send As permission is in Active Directory and the AD info can be cached for a while before it is refr

Hi ,

As per knowledge these kind of errors will occur  in the following situations .

1.Just assume that user A is trying to send an email as user B in outlook or owa by without having "SEND AS" permission over mailbox user B .so on such case user A will receive such kind of error messages.

2.Sometimes theses error may occur due to replication delay in AD.

3.In most cases these would be caused the autocomplete cache .

Hi,

If you send as other user's calendar, try to give you send as permission on that user's calendar.

If you receive this error on your own mailbox. Try to check the permission on user "NT AUTHORITY\SELF". By default, user NT AUTHORITY\SELF should only have the "FullAccess, ReadPermission" permission, if there is send-as permission on this user, try to remove it via remove-mailboxpermission command.

Get-MailboxPermission "User Name" | ? {$_.User -like "NT AUTHORITY\SELF"}

Best Regards.