Unable to send emails with attachment with error "Can't Send Mail. Your message has been moved to the outbox..."

Unable to send emails with attachment with error "Can't Send Mail. Your message has been moved to the outbox..."

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Article ID: CTX213580

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Updated On:

Description

Users are unable to attach files to their emails. It fails with the following error:

Error: "Can't Send Mail. Your message has been moved to the outbox. Please go to the outbox and try again."

Resolution

Configure the "uploadReadAheadSize" attribute on the Exchange server to a minimum of 204800 KB by doing the following steps:
  1. Open the command prompt
  2. Change directories to the C:\Windows\SysWOW64\inetsrv: CD C:\Windows\SysWOW64\inetsrv
  3. Determine the current metabase property value: appcmd.exe list config –section:system.webServer/serverRuntime
  4. Increase the metabase property value: appcmd.exe set config -section:system.webServer/serverRuntime /uploadReadAheadSize:"204800" /commit:apphost

Problem Cause

The configured limits for the "uploadReadAheadSize" attribute is exceeding the maximum bytes allowed in the entity body of a request.

Additional Information

The UploadReadAheadSize property establishes the number of bytes a Web server will read into a buffer and pass to an ISAPI extension. This occurs once per client request. The ISAPI extension receives any additional data directly from the client. The range is 0 to &HFFFFFFFF (4 GB).

https://www.iis.net/configreference/system.webserver/serverruntime
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