New Exchange 2013 incoming mails stuck in Q

Just started up a new exchange server and while testing I discovered incoming email is often delivered up to 90 mins after it was sent. looking around I discovered it stuck in the delivery q and going nowhere. Any ideas why the q traps some email?
8fort8Asked:
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Muhammad BurhanManager I.T.Commented:
please verify the Exchange's A record entry in your local DNS zone, hope this works.

or consider
https://exchangemaster.wordpress.com/tag/stuck-in-queue/

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8fort8Author Commented:
The server is a vm on the domain controller and its name appears as an a record pointing to the correct ip. There's also a ptr. no mx.
Muhammad BurhanManager I.T.Commented:
so what you found in event logs regarding this ?

http://msexchangeguru.com/2015/01/20/mails-queued-error-4-4-1/
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8fort8Author Commented:
The dns is fine The ms exchange  logs show event 6 cmdlet failing  claiming unknown ecp and administrator. I'm completely unsure why that is.


Cmdlet failed. Cmdlet Get-Notification, parameters {Summary=True}.

- EventData

   Get-Notification
   {Summary=True}
   ad.xyz.net/Users/Administrator
   S-1-5-21-539760016-2852313788-2424403731-500
   S-1-5-21-539760016-2852313788-2424403731-500
   Local-ECP-Unknown
   
   
- EventData

   Get-ExchangeServer
   {ErrorAction=SilentlyContinue, Identity=VMEXCHANGE2013}
   
   
   
   Local-Exchange Management Console-Unknown
   2684 ExSetupUI.exe
   
   32
   00:00:00.2031245
   View Entire Forest: 'True',  
   Microsoft.Exchange.Data.Directory.ADInvalidCredentialException: Active Directory operation failed on . The supplied credential for 'Server2013\Administrator' is invalid. ---> System.DirectoryServices.Protocols.LdapException: The supplied credential is invalid. at System.DirectoryServices.Protocols.LdapConnection.BindHelper(NetworkCredential newCredential, Boolean needSetCredential) at Microsoft.Exchange.Data.Directory.PooledLdapConnection.BindWithLogging() at Microsoft.Exchange.Data.Directory.PooledLdapConnection.BindWithRetry(Int32 maxRetries)
8fort8Author Commented:
Found issue and solution
Here:
http://serverfault.com/questions/693987/exchange-server-2013-receive-connector-confusion
  The errors are other separate issues but the Q problem is explained in detail on the link and worked instantly.
8fort8Author Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for 8fort8's comment #a41182168

for the following reason:

I found the answer in long after I posted the question and thought it may be of use to others.  But thanks to everyone who had suggestions.
8fort8Author Commented:
The link Mohammad provided did not solve the issue I was trying to solve however, it correctly identified a very common related issue that was misleading my efforts to solve the lesser issue I wrote about.
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