PREPARE AN EMAIL DIAGNOSTIC
Kanexio worksheet, 13 September 2026

Guide: https://kanexio.com/en/blog/business-emails-going-to-spam/
This worksheet organises the information to review with your administrator.
It does not run any automated analysis.

1. IDENTIFY THE INCIDENT

Date and time, including time zone:
Sender:
Recipient:
Channel used (mailbox, form, CRM, other):
Subject or internal reference:
Observed behaviour (rejected, marked as spam, missing):
Who noticed it and when:
Other affected recipients:
Examples delivered correctly, for comparison:

2. KEEP THE EVIDENCE

Full error response, if any:
Code and wording of that response:
Message-ID, if available:
Original message and headers retained with the administrator:
Reference for the logs consulted:
Any forwarding or intermediary service:

Share only the necessary information with authorised people.
Do not attach passwords or private keys.

3. SENDING SERVICES

Team mailboxes and provider:
Website forms and notification service:
CRM, invoicing, calendar or platform:
Technical contact for each channel:
Recent changes:

4. DOCUMENT THE INTERVENTION

Confirmed findings:
Checks still to carry out:
Proposed correction and reason:
Affected channels:
Previous configuration retained by the administrator:
Agreed test (channel, recipient, date):
Observed result after the intervention:
Next agreed check:

Technical delivery or valid authentication does not prove that a person has
read the message or that it will always reach the main inbox.

Useful sources:
Microsoft, non-delivery reports:
https://learn.microsoft.com/en-us/troubleshoot/exchange/email-delivery/ndr/non-delivery-reports-in-exchange-online
Microsoft, message tracing:
https://learn.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/message-trace-modern-eac
Google, viewing message headers:
https://support.google.com/mail/answer/29436?hl=en
IETF, DMARC:
https://www.rfc-editor.org/rfc/rfc9989.html

Contact: https://kanexio.com/en/contact/