Experience Exchange Sever

June 28, 2017

X-Microsoft-Exchange-Diagnostics-untrusted header – (NDR) Message header is too large

Filed under: Uncategorized — vijayarelangovan @ 2:53 pm

If your office 365 is setup to amend signatures to your email that are going out to external domains or attaching disclaimers to the email, then

There is existing issue.

The size of the message header grows drastically if you have this setup.  If you look at the messaging header, the content might be filled up like below,

X-Microsoft-Exchange-Diagnostics-untrusted: 1;VI1PR0602MB3232;7:eitiAZyhSkfzWdu2wx4WYDDsg97GybOhP52ygjEEopTGZOnqE44bl

T5+vSwWgBBvRj4qc7ypijFZ7jvebh9TbjvpifW3j5Y/nw90VgykX/xC1Wp7BKFQs7xdUpgBX7

hxaJGOvxvPEbUZ+6xcywCDxKwVE9jfPFxGtMA5ZL3IKUdcHKzrW4GoPKGimLIt94zJLY+IT

uqSBZdW+LAueVC2CDXSIcXefNpnoTDROP9yWvgCWbGNHLxD29iYcORDCkszvpXo+/hg9

Z/voAf75jxKb6Ph5lMVqUEjH1SKRHDImsVuQgT/1YqjDTr3JQ5ohxXspfMAxQIhd3Ghw8z9B

i+V7ltOGrdKKz7gTFWErJ/86NccrRyWFb37nFoAReh3IinALxOPsxPAy/woWk2xKcOqU1SJK

kHb9mYbCrHmue2jdZyeCzjcK3qYgMDaBGX1D2XnR42WYVNN6rxdWhC0vgrpaXEKOQOE

ixv+aTkODMoPWEFKeI/+6M5hsVNhoA+InBxBYWseFpTn9cUFctZ83g+1f+tP9uzOZapm+YC

4dk5TuqJ9JYvyNY1vc2AMfNMNVLRL8548dd+zcEakaMtpK3Syq3+ayIIZOHzZA1phacjTCB

S9oRbQzjkVUOP1TjPayPtmc05YtcQePNRdmSd3m5rIJHDpuFUr26x+4BALgo4yktxugimWB

XSx9zlXmkCv0AGEH/eR5D4JwM5pL5vf2Ui22z2aDUwnKj1azlIv+AKINbQZfXQJq+LuzHljj7

s7thi8O4Yo0PZoyp6ifNJK8YXc60zVw0axOMV1PMrlO7cv3G0=

 

Because of the large size of the message header, the recipient domain may reject your email saying it is not complaint or message header size is too large.

To fix the problem,

You can remove the X-Microsoft-Exchange-Diagnostics-untrusted header using transport rule,

messageheader

Or Simply wait until Microsoft fix it.

VJ

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