[SalesForce] In email coming from salesforce what is X-SFDC-EmailCategory

I would like to know what this statement means.
X-SFDC-EmailCategory: caseCommentNotification

Best Answer

You can find the details in below-mentioned links.

Source: https://help.salesforce.com/articleView?id=000205334&type=1

Within the email header content, search for the "X-SFDC-LK" & "X-SFDC-User" values

The values included for these entries will identify the Organization ID (X-SFDC-LK) and the User ID (X-SFDC-User) in which these emails originated.

Other useful information can be found in the headers of email from salesforce such as the

"X-SFDC-EntityId" which in the case of Workflow would show the id of the workflow that triggered the email.

Source: https://help.salesforce.com/articleView?id=000188046&type=1

Subject: test email
MIME-Version: 1.0
Content-Type: multipart/alternative; 
  boundary="----=_Part_31262_376962461.1389046146932"
X-SFDC-ORGTYPE: FREE
X-SFDC-LK: 00D50000000IQwR
X-SFDC-User: 00550000001Zf61
X-Sender: postmaster@salesforce.com
X-mail_abuse_inquiries: http://www.salesforce.com/company/abuse.jsp
X-SFDC-TLS-NoRelay: 1
X-SFDC-EmailCategory: emailAuthorEmail
X-SFDC-EntityId: 000000000000000
X-SFDC-Binding: 1WrIRBV94myi25uC
X-pstn-neptune: 0/0/0.00/0
X-pstn-levels: (S:49.31071/99.90000 CV:99.9000 FC:95.5390 LC:95.5390 R:95.9108 P:95.9108 M:97.0282 C:98.6951 )
X-pstn-dkim: 0 skipped:not-enabled
X-pstn-cm-addresses: from <wbamann@salesforce.com> (approved)
X-pstn-settings: 3 (1.0000:0.0005) s cv gt4 gt3 GT2 gt1 p
X-pstn-addresses: from <wbamann@salesforce.com> forward (org good) [db-null]
X-pstn-nxpr: disp=neutral, envrcpt=wbamann@salesforce.com
X-pstn-nxp: bodyHash=fc046c0b5e85cebaf6cfb21b69bd44573fc1d653, 
headerHash=479949543731a27d88943ececf83136227a00a56, keyName=4,
rcptHash=d2bdf7edb11a749779317b57aa4594a2c9712fa7,
sourceip=204.14.232.79, version=1

------=_Part_31262_376962461.1389046146932
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

test email

THIS IS A TEST

_____________________________________________________________________
Powered by salesforce.com
http://www.salesforce.com/

------=_Part_31262_376962461.1389046146932
Content-Type: text/html; charset=UTF-8


You can see the Fields that will identify the type of organization sent the Email as well as the ID and the User.

X-SFDC-ORGTYPE: FREE X-SFDC-LK: 00D50000000IQwR X-SFDC-User: 00550000001Zf61h


NOTE The field X-SFDC-ORGTYPE will only display from Emails sent out of "Free' or "Trial" Orgs. This will not display when sent from
 any other environment.
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