This looks like a message that maybe might've been sent to a reflectiv.net
address (perhaps the one advertised on your website? contact at
reflectiv.net?) and then automatically forwarded by Mailgun (which hosts
inbound mail for reflectiv.net) to a Google account (since Mailgun probably
doesn't do mailbox hosting).
That's just purely a guess, based on
1. X-Mailgun-Incoming: Yes
appearing in the headers, and the MX record for reflectiv.net, and the
message coming to Google with the following Return-Path:
1. Return-Path: <bounce+3dbf11.71c471-{redacted}=gmail....@reflectiv.net>
Does that sound plausible?
On Wed, Jan 11, 2023 at 4:07 PM Cyril - ImprovMX via mailop <
mailop@mailop.org> wrote:
> Hi everyone!
>
> Today, I received a spam ("I got full access to your computer and
> installed a trojan" kind of email). In general, I completely ignore these,
> but today was different:
>
> The sender and recipient were my own email! What's odd is that I did
> configure SPF (granted, with a "~") but also a DMARC reject policy.
>
> Looking at the email headers and also the output from GMail, both SPF and
> DKIM were successful ("pass"), which means the sender, somehow, was able to
> send an email using my account.
>
> I would love your input on the issue, but here are my thoughts so far:
>
> 1. My account was compromised, and the password was leaked, allowing that
> user to send an email with my account. This would make sense, but the
> sending account was only used to be configured within GMail. As soon as the
> password was generated, I pasted it on GMail and never saved it elsewhere.
> 2. Theoretically, if I were to create an account on Mailgun, I would be
> able to send an email from my account and have a valid SPF for any other
> services that use Mailgun too (since their SPF would include Mailgun's
> IPs), but it wouldn't explain the valid DKIM though. For this, Mailgun
> should only allow my account to be able to send using my domain.
> 3. Did Mailgun have any database leak that I wasn't aware of?
>
> Of course, as soon as I saw this email, I generated a new password for my
> account, but I still wonder how this could have happened. I would
> appreciate if you had any insights I've missed that would make sense.
>
> Here are the headers from the email with my end email redacted:
> https://pastebin.com/knqbTa8K
>
> Thank you!
> _______________________________________________
> mailop mailing list
> mailop@mailop.org
> https://list.mailop.org/listinfo/mailop
>
--
*Todd Herr * | Technical Director, Standards and Ecosystem
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*m:* 703.220.4153
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