Maximum number of recipients per message

Hi,

i am trying to send a mail with about 500 recipients from Outlook connected with Outlook Anywhere to the Exchange 2013 Server. For each user i get an error saying mail could not be send - Error: [0x80004005-00000000-00000000].

If i send mails only to a few recipients it works with no problem.

I found the following limitations:

get-ReceiveConnector | fl identity, MaxRecipientsPerMessage

MaxRecipientsPerMessage : Default : 5000, other connectors : 1000

get-transportservice | fl PickupDirectoryMaxRecipientsPerMessage

PickupDirectoryMaxRecipientsPerMessage : 100

get-transportconfig | fl maxrecipientenvelopelimit

maxrecipientenvelopelimit : 1000

get-mailbox user| fl RecipientLimits

RecipientLimits : Unlimited

Did i missed something?

Thanks Martin