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We use google apps for business to host our business emails, using our own custom domain mysite.com.

I view my emails via gmail.com

I recently received an email from me@mysite.com to me@mysite.com stating id been hacked etc.. send BTC.. They even had a password that i had used previously. (The password they had was obviously from a data dump of a hacked site and as we use a password manager to create unique passwords im not too concerned.)

My concern is how they where able to spoof the from address ? I thought google apps for business had some default protection against this ? How can i protect against this ?

  • We can't really help just by the short description you provided. Only the header information will tell you and us what actually is going on. – schroeder Mar 31 at 11:38
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It's a common problem with email providers, something which gmail, outlook, yahoo etc all suffer from. They don't have adequate SFP/DMARC protections so it's possible to spoof an email from any @gmail.com account via a service such as SendGrid.

Like you've already identified, they probably found your old password in a dump online and are mass emailing out spoofed emails. An interesting new type of scam.

  • Gmail has more than adequate SPF/DMARC protections. SendGrid does not "spoof" anything. – schroeder Mar 31 at 20:13
  • I'm a bit confused here schroeder, you have a very good ranking on stack exchange, but have you actually tested this? Because i've used SendGrid to spoof emails from both gmail.com and outlook.com in the past few months. I went and checked now and they have actually updated their protections in the last 2 days (outlook:docs.microsoft.com/en-us/office365/securitycompliance/…). So this shouldn't actually be possible now, but certainly was prior to this. – Jacob2471 Apr 1 at 0:14
  • Then you might need to define what you mean by "spoof" – schroeder Apr 1 at 6:50

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