Get-MessageTrackingLog -EventId "Fail" : message too large for this organization

Question

Hi, I see that outgoing emails are failing with 9MB attachment. I have created an receive connector which accepts anonymous connections from applications and deliver the email to internet. It is configured to receive max receive message size of 25MB. My send connector has max size limit 35MB I am sending email to gmail account which can receive upto 50MB. I am running the following command

Get-transportserver | Get-messagetrackinglog -start "02/19/2024" -resultsize unlimited -Sender "******@sender.com" -recipient "******@gmail.com"  -EventId "fail" |
 fl RecipientStatus

I get the following results:

RecipientStatus : {[{LED=550 5.2.12 RESOLVER.RST.SendSizeLimit.Org; message too large for this organization};{MSG=};{FQDN=};{IP=};{LRT=}]}
RecipientStatus : {[{LED=550 5.2.12 RESOLVER.RST.SendSizeLimit.Org; message too large for this organization};{MSG=};{FQDN=};{IP=};{LRT=}]}
RecipientStatus : {[{LED=550 5.2.12 RESOLVER.RST.SendSizeLimit.Org; message too large for this organization};{MSG=};{FQDN=};{IP=};{LRT=}]}
RecipientStatus : {[{LED=550 5.2.12 RESOLVER.RST.SendSizeLimit.Org; message too large for this organization};{MSG=};{FQDN=};{IP=};{LRT=}]}

I am not sure if emails are rejected by my server or from gmail? I would appreciate if someone can help for further troubleshooting

Answer 1

Hello @SKB ,

LED=550 5.2.12 RESOLVER.RST.SendSizeLimit.Org; message too large for this organization

This error message usually seems to indicate that the email was rejected by your own server because the message exceeded the maximum allowed size limit set by your organization's mail server.

Even if you have set the maximum receive message size to 25MB on the Receive connector and the maximum send message size to 35MB on the Send connector, there may be size limits elsewhere that are causing this issue. Here are some things you could check:

1.Global transport settings: Check the global transport settings in Exchange Server. To do this, run the following command in the Exchange Management Shell:Get-TransportConfig | fl MaxSendSize, MaxReceiveSize

2.User mailbox settings: Check if the sender's mailbox has any sending size limits set. You can check this by running the following command in the Exchange Management Shell:Get-Mailbox <MailboxName> | fl MaxSendSize, MaxReceiveSize

Besides, please note that the email size calculated by the mail server will be larger than the size of the attachment. This is due to the added overhead of MIME encoding of the attachment, which can increase the size by approximately 33%. Therefore, sending a 9MB attachment may be larger than 12MB.

Hope the above information is helpful to you！

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