Collaborate Disseminate
When I send a multipart email from my server to outlook.com, but have it forwarded to a Gmail account (or anywhere else), DKIM fails, with the message “body hash did not verify”, even though as far as I can tell the body look… Continue reading outlook.com breaks DKIM when forwarding for multipart messages
A friend received a spoofed email (from Bank of America using an uber.com address) which was correctly identified as ‘spam’ by Gmail. However, looking at the raw message it seems to have passed SPF, DKIM and DMARC checks.
1… Continue reading How did a phishing email pass SPF, DKIM and DMARC?
DMARC produces “pass” result if and only if at least one of SPF and DKIM checks pass. It has been noted that DKIM provides stronger protection of the two (if implemented properly). But, in order to require namely DKIM passing… Continue reading What is the reason for DMARC spec to not require specifically SPF or DKIM pass?
I have an app whose main purpose is to help people track emails they send.
In most user onboarding, The user is sent a secret URL via email. They validate by clicking a link to return the secret.
An alternative would be to… Continue reading Email verification by sending mail instead of receiving
I have spent a bit of time researching SPF, DKIM and DMARC mechanisms however If I understand correctly, these help the recipient to confirm whether the domain is legitimate but only if they have these mechanisms configured c… Continue reading SPF, DKIM and DMARC – How do receiving/recipient mail servers know how and when to validate the mail?
Across nations and industries, one technology has been sharing countless secrets for well over two decades. Yes, despite the rise of social media, messaging apps and project management tools, email remains the de facto number one online communication c… Continue reading Email Security: How Basic Frameworks Help WordPress Site Owners
DKIM, as read by rfc4871, states to make address forgery more difficult besides protecting sender identity and integrity of the mail.
I have been searching for the details, which precise validation step prevents From:-header… Continue reading Understanding DKIM validation
My organization is working with a vendor that needs to send emails on our behalf. They want us to import a PFX certificate into a DKIM key. We want to understand the implications first.
What precautions can/should we take?
… Continue reading Giving a PFX cert to a 3rd party email service for DKIM?
Does it provide any trust at all to have DKIM set up correctly in my DNS but not sign any emails? I could not find any information about that.
Now, if I send an email to a domain/server with DMARC set up, with policy=reject … Continue reading Is it bad to use DKIM DNS without signing mails?
Today I got a scam e-mail which I decided to disect. I quickly found that it was sent from a GMail address (From, Reply-To, Return-Path) but that the mail itself came from Yahoo.
HELO from Yahoo
Received from IP maps both … Continue reading Why does DKIM verification succeed with a signature from Yahoo when all headers are spoofed to look like GMail?