AC468 Unit 6 Email Header Trace Example

Reviewed by Chester Goodwin, MBA Digital Forensics and Investigative Techniques Purdue University Global Free custom sample in 24 to 48h

This AC468 Unit 6 email header trace examines a message that passed SPF, DKIM and DMARC and still redirected $186,450 of a supplier payment. Purdue Global AC 468, Digital Forensics and Investigative Techniques, gives BS in Accounting students one message to read line by line. At Belmonte Fine Foods, an invented wholesale food firm, the headers are taken from the hashed mailbox export, not a forwarded copy. Four Received lines are read from the bottom up, and only those written by Belmonte's own provider are relied on. The trace explains why the checks passed for a lookalike domain, compares routing, signing domain and Reply-To with fourteen genuine supplier messages, and names the provider and registrar records that legal process could add.

CourseAC468 Digital Forensics and Investigative Techniques
UnitUnit 6
Paper typeEmail header trace
LengthAbout 630 words, 5 pages double-spaced
FormatAPA 7 student paper
SchoolPurdue University Global
ProgramBS in Accounting
UpdatedOctober 2026

Free sample paper for AC468 Unit 6

1

Every Check Passed: A Unit 6 Email Header Trace of a Lookalike Supplier Message and Fourteen Genuine Ones

[Student Name]

Purdue University Global

AC468: Digital Forensics and Investigative Techniques

Unit 6 Email Header Trace

[Instructor Name]

[Date]

Belmonte Fine Foods, its supplier, every domain, server name and address are composite; the standards and article cited are real.

What this part is doingNaming the passing checks and the comparison method in the lead shows why the trace is needed.
2

The Header Block

The full internet headers were taken from the mailbox export hashed in Unit 2, not from a forwarded copy, because forwarding rewrites headers. The From line shows the display name of the supplier's export manager and an address whose domain adds a single hyphen to the genuine one. The Reply-To line names a second address at the same lookalike domain. The Date line claims +0100, which matches Spain's standard time on March 17, but that line is written by the sender's own software and proves nothing about where the sender was. The message format and the meaning of each header field are set by the internet message standard (Resnick, 2008).

Reading the Received Chain

Each mail server adds its own Received line on top of those already present, so the chain is read from the bottom up. Four Received lines appear.

1. Bottom line: a submission server at a free webmail provider accepted the message from an authenticated client at 15:37:52 UTC.

2. Second line: the provider's outbound relay passed it on at 15:37:54 UTC.

3. Third line: Belmonte's cloud mail provider received it from that relay at 15:38:01 UTC, recording the relay's address.

4. Top line: Belmonte's provider delivered it to the mailbox at 15:38:03 UTC.

Only the top two lines were written by servers Belmonte's provider controls, so only they are relied on. They establish that the message entered Belmonte's tenant from the webmail provider's relay. The lower lines are consistent with that, but a sender can write anything below the first trusted server, so they are treated as claims (Tariq Banday, 2011).

Authentication Results

Belmonte's provider stamped an Authentication-Results header recording SPF pass, DKIM pass and DMARC pass, all for the lookalike domain. SPF passed because the lookalike domain's published record authorizes the webmail provider's servers (Kitterman, 2014). DKIM passed because the provider signed the message with a key published for the lookalike domain. DMARC passed because the From domain matched the domain that passed SPF and DKIM.

A pass means only that the message really came from the domain in its From line, and anyone who registers a lookalike domain can make every check pass for that domain, so authentication results prove which domain sent a message, not which company.

What this part is doingThe highlighted sentence explains the result that confuses most readers, the core point of this unit.
3

Comparison With Fourteen Genuine Messages

Fourteen messages from the supplier's real domain between April and December of the prior year were pulled from the same export. Every one entered Belmonte's tenant from the supplier's own hosted mail service, was signed with a DKIM key for the real domain, and carried a Reply-To identical to its From address or none at all. The March 17 message differs on all three points: a different relay, a different signing domain and a Reply-To at the lookalike domain. Those differences, not the authentication results, separate the spoofed message from genuine mail.

What the Provider's Records Could Add

The Received chain stops at the webmail provider. That provider's records could show the account that submitted the message, the address it connected from, and when the account was created. They are reachable only through counsel and legal process, and a provider will generally not release message content to a civil litigant. The registrar's records for the lookalike domain, created on March 12 according to its public registration data, may also name a payment method. The trace recommends both requests in the Unit 9 memo.

What this part is doingEnding on what only outside records can show keeps the trace within what the headers prove.
4

References

Kitterman, S. (2014). Sender Policy Framework (SPF) for authorizing use of domains in email, version 1 (RFC 7208). Internet Engineering Task Force. https://doi.org/10.17487/RFC7208

Resnick, P. (Ed.). (2008). Internet message format (RFC 5322). Internet Engineering Task Force. https://doi.org/10.17487/RFC5322

Tariq Banday, M. (2011). Techniques and tools for forensic investigation of e-mail. International Journal of Network Security & Its Applications, 3(6), 227-241. https://doi.org/10.5121/ijnsa.2011.3617

AC468 Unit 6 instructions, in plain terms

Unit 6 of AC468 asks you to trace one email through its headers and explain what they prove. Work from the full internet headers taken from a preserved export, since forwarding rewrites them. Reproduce the key header lines before interpreting them. Read the Received chain from the bottom up, record the server, address and time each line adds, and say which lines were written by servers you can trust. Explain the authentication results in plain terms: what SPF, DKIM and DMARC each check, and what a pass does and does not show. Compare the suspect message with genuine messages from the same sender on routing, signing domain and reply address. Close by naming the outside records needed to identify the sender. Cite the message format and SPF standards and an email forensics article in APA 7.

Inside the AC468 Unit 6 example

The sample states that headers came from the Unit 2 mailbox export and describes the From, Reply-To and Date lines, noting that the Date offset is written by the sender's software. Four Received lines are listed from the submission server at a webmail provider up to delivery, and only the top two, written by Belmonte's provider, are relied on. The authentication section explains each pass for the lookalike domain, and the highlighted sentence states that a pass proves which domain sent a message, not which company. Fourteen genuine supplier messages are compared on relay, signing domain and Reply-To, and the suspect message differs on all three. The closing section names the webmail provider's and registrar's records and the limits on reaching message content.

AC468 Unit 6 rubric: what earns full points

Header traces in AC468 earn points for reading the Received chain in the right direction and for trusting only lines written by known servers. Graders check that each hop is recorded with server, address and time. The rubric gives significant credit for an accurate explanation of authentication results, especially recognizing that passes for a lookalike domain are expected rather than reassuring. Comparison with genuine messages from the same sender is where the finding is made, and traces that skip it rarely reach the top band. A closing statement of what only outside records can establish shows the student knows the method's limit. Citing the relevant standards in APA 7 supports each technical point.

Common AC468 Unit 6 mistakes, and how to avoid them

The most common Unit 6 error is reading Received lines from the top down, which reverses the message's path. A close second is trusting every line, including those a sender could have written before the first trusted server. Many traces report that SPF, DKIM and DMARC passed and conclude the message was genuine. Display names are treated as identity. Forwarded copies are analyzed instead of headers from a preserved export. No genuine messages are compared, so the differences that matter are never shown. If your section gave you its own raw headers or a different mail platform, our writers can trace that message and set it against the comparison messages provided.

Get an AC468 Unit 6 example written to your instructions

Raw header text, copied in full rather than captured as a screenshot of the message, is what a Unit 6 trace needs, together with any comparison messages, the prompt and the rubric. Hops are read in order and relied on only where trustworthy. The first custom trace is free; it lands within 24-48h. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.

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AC468 Unit 6 questions, answered

Why read Received headers from the bottom up?

Each mail server that handles a message adds its own Received line above the existing ones. The bottom line was therefore added first and the top line last, by the receiving system. Reading upward follows the message's actual path, and it lets the trace mark where lines stop being added by servers anyone can trust.

If SPF and DKIM passed, how can the email be fraudulent?

Because those checks confirm that the domain in the message authorized the sending server and signed the content. They say nothing about whether that domain is the one the reader thinks it is. A lookalike domain registered by an impostor can pass every check, which is why the trace compares the signing domain with genuine messages.

Can the trace use headers from my section's scenario?

Yes. Paste the full raw headers, include any genuine messages provided for comparison, and attach the prompt and rubric. Each Received line is read in order, trusted only where appropriate, and the authentication results are explained for the domains actually present, with any limits on what the headers can show stated plainly.

Where can I find a free AC468 Unit 6 sample paper?

This page holds a full AC468 Unit 6 email header trace of a lookalike supplier message at Belmonte Fine Foods with the Received chain read bottom up, authentication results explained, fourteen genuine messages compared and APA 7 references.

Why can't the trace identify the person who sent the message?

The headers stop at the webmail provider that accepted it. Only that provider's records can show the submitting account, its connection address and when it was created, and those require a subpoena obtained through counsel.