Standardizing Exchange email attachment size delivery with Symantec Email gateway ?

People,

Can anyone here please let me know what is the best practice to standardize the email size limit for all Email Infrastructure application ?

the result from the Exchange Server 2010 Powershell:
[PS] C:\>Get-ReceiveConnector | fl *MaxMessageSize*
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)

[PS] C:\>Get-SendConnector | fl *MaxMessageSize*
MaxMessageSize : 100 MB (104,857,600 bytes)

[PS] C:\>Get-TransportConfig | fl *Max*
MaxDumpsterSizePerDatabase      : 50 MB (52,428,800 bytes)
MaxDumpsterTime                 : 7.00:00:00
MaxReceiveSize                  : 50 MB (52,428,800 bytes)
MaxRecipientEnvelopeLimit       : 5000
MaxSendSize                     : 50 MB (52,428,800 bytes)
ExternalDsnMaxMessageAttachSize : 25 MB (26,214,400 bytes)
InternalDsnMaxMessageAttachSize : 25 MB (26,214,400 bytes)

Open in new window


the value that I can see from the Symantec Email Gateway (Brightmail):
Both Inbound and Outbound: 20971520 bytes

Source: https://support.symantec.com/en_US/article.TECH95239.html

This was the configuration that I am now seeing in the Exchange Server produciton server left by my predecessor.

Do I have to match the size of the

"In/Outbound SMTP Configuration Maximum message size in bytes" in Symantec to be the same as the "In/ExternalDsnMaxMessageAttachSize " in Exchange server ?

and so if there is any modification that is required to change the value in Exchange or in Symantec Mail Gateway, does it cause any outage or requires a service to be reset ?
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Senior IT System EngineerIT ProfessionalAsked:
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suriyaehnopCommented:
The symantec Inbound/outbound size will be a total size if email (including attachement) which around 20MB

If you internal user send an email to external user with 20MB attachment, symantec may reject since after conversation the total size of the email may over the symantec outbound settings
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Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, so in this case I need to make it like the following:

"In/Outbound SMTP Configuration Maximum message size in bytes" in Symantec =  25 MB
"In/ExternalDsnMaxMessageAttachSize " in Exchange server = 20 MB

like 25 MB in total with added 5 MB as the buffer or inline attachment ?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
What about the Transport Dumpster size ?
how big should I set it ?

my Mailbox servers are all stand alone no DAG.
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Jian An LimSolutions ArchitectCommented:
MaxDumpsterSizePerDatabase      should be 1.5 times the message size.
in your case, would be 37.5mb


http://blogs.technet.com/b/nawar/archive/2010/06/28/transport-dumpster.aspx
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Lim,

With my Exchange Server 2010 SP3 at the moment it is set to be 50 MB for some reason even if i do not have DAG in the two mailbox servers.

So if I change the size using the Exchange Management Console, is there any outage to the current email flow ?
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Jian An LimSolutions ArchitectCommented:
the default value is 18mb so your ancestor has definitely touch that value.

in any case, keeping it big won't hurt. It means it has some additional redundancy (or you can call it 'waste')

it really happen on per database,  
assuming in your environment, you won't have more than 10 database. i.e. it only going to cost you 50X10 = 500mb (which is really little consider your pagefile might be higher then this)
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Ah I see,

I'm afraid to touch it because I don't know how it will affect the exchange server mail flow company wide.

So making it 1.5 size of the maximum email size can be safely configured Through Exchange console GUI right ?
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Jian An LimSolutions ArchitectCommented:
1.5 size is the dumpster.

maximum email size can be safely configured through Exchange Console.
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Jian An LimSolutions ArchitectCommented:
one thing to notice, the change will not take in place until few hours later (due to caching) unless you restart the transport services immediately.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Ah I see.

For the caching ? Which change is this that you mention ?

If I leave it like that, does it eventually change by itself or do I must restart the service manually ?
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Jian An LimSolutions ArchitectCommented:
It will configuration change by itself after 2 to 4 hours randomly. ,
Just that under a proper change management, you can't test it immediately. So you don't panic why it doesn't work immediately you change the limits.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
OK if that's the case then I'll leave it to change the value by itself since I'm in no rush to make it in effect.

I'm just standardising the values below to a certain number consistently:

[PS] C:\>Get-ReceiveConnector | fl *MaxMessageSize*
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)
MaxMessageSize : 100 MB (104,857,600 bytes)

[PS] C:\>Get-SendConnector | fl *MaxMessageSize*
MaxMessageSize : 100 MB (104,857,600 bytes)

[PS] C:\>Get-TransportConfig | fl *Max*
MaxDumpsterSizePerDatabase      : 50 MB (52,428,800 bytes)
MaxDumpsterTime                 : 7.00:00:00
MaxReceiveSize                  : 50 MB (52,428,800 bytes)
MaxRecipientEnvelopeLimit       : 5000
MaxSendSize                     : 50 MB (52,428,800 bytes)
ExternalDsnMaxMessageAttachSize : 25 MB (26,214,400 bytes)
InternalDsnMaxMessageAttachSize : 25 MB (26,214,400 bytes)
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Jian An LimSolutions ArchitectCommented:
hold on ..
i want to understand onething
you are trying to standardise your messagesize in Exchange and symantec


the value that I can see from the Symantec Email Gateway (Brightmail):
Both Inbound and Outbound: 20971520 bytes (20 MB)

Hence, you should not have anything above 20mb


The Internet standard is 25MB (roughly)

https://www.outlook-apps.com/maximum-email-size/


there is 2 philosophy here.
1. do nothing. There are nothing to have the setup you have. This means internally, you might able to send large email but when it means it reach the internet phase (your symantec gateway) will help you to prevent sending email that external parties cannot accept (which is 20MB)

2. standardize them to the same. means you should not see anything over 20MB. but that also means some internal users might not able to send large emails anymore (internal). They might not like it. (large email is a headache for administrator seriously! this is email system! not file repository!)
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Yes Lim,

So I'd like to standardize for all internal and external email:

Symantec:
In/Outbound SMTP Configuration Maximum message size in bytes: 25 MB (26,214,400 bytes)

Open in new window


Exchange Server:
MaxDumpsterSizePerDatabase      : 50 MB
MaxDumpsterTime                 : 7.00:00:00
MaxReceiveSize                  : 25 MB (26,214,400 bytes)
MaxRecipientEnvelopeLimit       : 5000
MaxSendSize                     : 25 MB (26,214,400 bytes)
ExternalDsnMaxMessageAttachSize : 25 MB (26,214,400 bytes)
InternalDsnMaxMessageAttachSize : 25 MB (26,214,400 bytes)

Open in new window


is that number above correct or do I need to change some values larger /smaller?
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Jian An LimSolutions ArchitectCommented:
that will be good.

Just a side note, that messageattachsize of 25mb will not really means they can attach a 25mb attachment. this will definitely be lower due to the encryption and message header and etc. (roughly 10% to 20% on top of the original attachment size)

Just found a link that articulate how the size will be look calculated by.
http://eightwone.com/2010/09/29/exchange-message-size-limits/
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks !
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