Exchange Server 2010 Event Error 1020 using Powershell

Windows 2008 R2 Server
Exchange 2010 Enterprise RU10

Created a PowerShell script to send email

$body = netsh advfirewall firewall show rule name="Block_IP" | Out-String
$PSEmailServer = "SERV025.FQDN.COM"
Send-MailMessage -From "no-reply@mydom.com" -To "support@mydom.com" -Subject "SERV025 Firewall Rule BlockIP Updated" -Body $body -smtpserver $PSEmailServer

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I run this on my computer using powershell after I do this Enter-pssession -computername serv025

It works great.

Now I try to run the same script on my SERV025 (Windows 2008 R2 with Exchange 2010)

I get this event error

Log Name:      Application
Source:        MSExchangeTransport
Date:          7/22/2015 7:32:49 PM
Event ID:      1020
Task Category: SmtpReceive
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      SERV025.FQDN.com
Description:
The account 'mydom\administrator' provided valid credentials, but is not authorized to use the server; failing authentication.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSExchangeTransport" />
    <EventID Qualifiers="32772">1020</EventID>
    <Level>3</Level>
    <Task>1</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-07-22T23:32:49.000000000Z" />
    <EventRecordID>206601</EventRecordID>
    <Channel>Application</Channel>
    <Computer>SERV025.FQDN.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data>MYDOM\administrator</Data>
    <Data>Default SERV025</Data>
  </EventData>
</Event>

Found this

The suggested resolution is to verify that the account that is specified in the event text has the MS-Exch-SMTP-Submit permission assigned to it on the appropriate Receive connectors on the Hub Transport server or Edge Transport server.


and I did this

PS] C:\Windows\system32>Add-ADPermission "Client SERV025" -User "mydom\Administrator" -ExtendedRights ms-Exch-SMTP-Accept
-Authoritative-Domain-Sender

Identity             User                 Deny  Inherited
--------             ----                 ----  ---------
SERV025\Client SER... mydom\administrator    False False


[PS] C:\Windows\system32>Add-ADPermission "Client SERV025" -User "mydom\Administrator" -ExtendedRights ms-Exch-SMTP-Accept
-Any-Sender

Identity             User                 Deny  Inherited
--------             ----                 ----  ---------
SERV025\Client SER... mydom\administrator    False False

Still getting the event 1020


What am I missing here