I have a recently-deployed 1 server windows domain running Windows 2008 R2 Standard SP1 and Exchange 2010 SP3, running on the 2003 R2 domain and forest level. The server receives email through a main and backup ADSL router using port 25 (SMTP), and PopWeasel, a POP3 collector. The Exchange server is protected by Sophos PureMessage 3.1.2
The exchange server was deployed with an email size limit of 10MB (I believe that's Exchange 2010's default value) - I want to increase that to 15MB, but I'm having trouble doing this.
Using a Test email with an 11MB attachment (to allow for headers and encoding bloat), Internal to Internal email, and internal to external email is working fine.
External to internal email generates a bounce-back to the sender, the core part of which is:
Administrator@[EmailDomain].co.uk
[InternalServerName].local #<[InternalServerName].local #5.3.4 smtp;550 5.3.4 SMTPSEND.OverAdvertisedSize; message size exceeds fixed maximum size> #SMTP#
This happens whether the email comes in the either of the two SMTP connections; it gets delivered when using the POP3 collector, but I believe as it "Originates" from the server's IP address, it's treated as an internal-internal email, which does work fine
I have gone through with Sophos Support, and they have confirmed there is no size limitations in the current PureMessage config.
Working through this Exchangepedia article, I can't see any issues in the Management console or Exchange Shell.
I've got the full dumps of the Transports available if needed (Get-TransportConfig, Get-ReceiveConnector "External Email" | Format-List, Get-SendConnector "SmartHost Connector" | Format-List, Get-ADSiteLink, and Get-mailbox | ft name, MaxSendSize, MaxReceiveSize), but here are the commands and summary reports taken from this LAN-Tech article:
Get-TransportConfig | ft name, MaxSendSize, MaxReceiveSize
Name MaxSendSize MaxReceiveSize
---- ----------- --------------
Transport Settings 15 MB (15,728,640 bytes) 15 MB (15,728,640 bytes)
Get-ReceiveConnector | ft name, MaxMessageSize
Name MaxMessageSize
---- --------------
External Email 15 MB (15,728,640 bytes)
Internal Email 15 MB (15,728,640 bytes)
Get-mailbox | ft name, MaxSendSize, MaxReceiveSize
Name MaxSendSize MaxReceiveSize
---- ----------- --------------
Administrator 20 MB (20,971,520 bytes) 20 MB (20,971,520 bytes)
DiscoverySearchMailbox {D919BA05-46A... 100 MB (104,857,600 bytes) 100 MB (104,857,600 bytes)
Test User unlimited unlimited
User1 unlimited unlimited
User2 unlimited unlimited
User3 unlimited unlimited
Etc..
I Set the Administrator to a 20MB limit, rather than the transport Hub default, but the 11MB Email fails when sent to the Administrator, the Test User, or anyone else.
I also checked the ADSIEdit settings, even though it shouldn't apply as we're not running in 2003 mixed mode:
delivContLength - 15360 submissionContLength - 15360 msExchRecipLimit - 100
Can anyone think of something I may have overlooked? I'm at a bit of a loss to explain what's blocking the email.
In reply to @TheCleaner, - Running Get-SendConnector gives my single outbound connector:
Identity AddressSpaces Enabled
-------- ------------- -------
SmartHost Connector {SMTP:*;1} True
Running Get-SendConnector "SmartHost Connector" | Format-List gives:
AddressSpaces : {SMTP:*;1}
AuthenticationCredential :
Comment :
ConnectedDomains : {}
ConnectionInactivityTimeOut : 00:10:00
DNSRoutingEnabled : False
DomainSecureEnabled : False
Enabled : True
ErrorPolicies : Default
ForceHELO : False
Fqdn : [External Address URL]
HomeMTA : Microsoft MTA
HomeMtaServerId : [ServerName]
Identity : SmartHost Connector
IgnoreSTARTTLS : False
IsScopedConnector : False
IsSmtpConnector : True
LinkedReceiveConnector :
MaxMessageSize : 15 MB (15,728,640 bytes)
Name : SmartHost Connector
Port : 25
ProtocolLoggingLevel : None
RequireOorg : False
RequireTLS : False
SmartHostAuthMechanism : None
SmartHosts : [SmartHost URL]
SmartHostsString : [SmartHost URL]
SmtpMaxMessagesPerConnection : 20
SourceIPAddress : 0.0.0.0
SourceRoutingGroup : Exchange Routing Group (DWBGZMFD01QNBJR)
SourceTransportServers : {[ServerName]}
TlsAuthLevel :
TlsDomain :
UseExternalDNSServersEnabled : False
I believe that's set right.
I tried restarting Exchange and IIS when I first worked on this last week. When that didn't make a difference, I rebooted the whole server.
Update (15/04/13)
I've applied 20MB Limits, and run Get-TransportConfig | ft name, MaxSendSize, MaxReceiveSize, Get-ReceiveConnector | ft name, MaxMessageSize, Get-mailbox | ft name, MaxSendSize, MaxReceiveSize, and Get-SendConnector "SmartHost Connector" | Format-List to confirm the Shell agrees with the console. I than Re-started the Transport service, as per Jeremy's Suggestion. That's allowing an 11MB email through now, so thanks for the help, Jeremy & TheCleaner
I find it hard to believe an 11MB email can can get bloated up by almost a third - what's the best way to get the correct size of the email when passing through exchange?
