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Is DKIM and SPF sufficient to avoid inbound email spoofing from a certain domain?


Is DKIM and SPF sufficient to avoid inbound email spoofing from a certain domain?

By : user2948455
Date : November 14 2020, 04:51 PM
should help you out Within the bounds of your question, yes. As long as you have a good signature that matches the record published by the email sender, you can be assured that it's valid (within the bounds of the encryption security, don't trust keys less than 1024 bits).
DMARC is the coordinating standard that informs servers of whether they SHOULD accept email that has a failing signature. gmail currently published a DMARC record saying to accept all email from gmail.com, even if it has a failing signature. That makes things a little more complex.
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Email header showing, dkim=hardfail (test mode) and dkim=permerror (bad sig)

Email header showing, dkim=hardfail (test mode) and dkim=permerror (bad sig)


By : mangasmartin
Date : March 29 2020, 07:55 AM
Does that help You didn't mention whether you are using a standard library to calculate the DKIM signature, or have done your own. I strongly recommend OpenDKIM as a good library to use if you aren't already.
Another place to test is to send a message to the mail reflector at sa-test@sendmail.net. It may give you more diagnostic information.
if you enable DKIM for a domain, can you send using mail servers which do not use DKIM?

if you enable DKIM for a domain, can you send using mail servers which do not use DKIM?


By : Lenderson Morais
Date : March 29 2020, 07:55 AM
I wish did fix the issue. It shouldn't be a problem. Having the DKIM signature on your messages is a 'plus' as far as indicating to spam filters and other mail servers that these messages are valid messages. But, not having the DKIM signature would not be considered a 'strike'.
DMARC Anti-Spoofing Error When Sending Email with Sender Yahoo Domain Other Than Server Domain

DMARC Anti-Spoofing Error When Sending Email with Sender Yahoo Domain Other Than Server Domain


By : Johny Guerreiro
Date : March 29 2020, 07:55 AM
help you fix your problem Yes Allan, you are correct in assuming that the anti-spoofing that Yahoo (and now AOL) have turned on is permanent. The technology they are using is called DMARC. Yahoo has published a DMARC record in their DNS:
$ dig TXT _dmarc.yahoo.com. +short "v=DMARC1; p=reject; sp=none; pct=100; rua=mailto:dmarc-yahoo-rua@yahoo-inc.com, mailto:dmarc_y_rua@yahoo.com;"
If my domain is using gsuite and I am using gmail's DKIM, will that DKIM setting be used by another sender on my spf? ie

If my domain is using gsuite and I am using gmail's DKIM, will that DKIM setting be used by another sender on my spf? ie


By : akirk541
Date : March 29 2020, 07:55 AM
To fix the issue you can do To answer your question: A DMARC reject or quarantine policy helps improve deliverability for all parties that send on behalf of your domain AND properly authenticate by SPF or DKIM, in alignment with your domain.
DKIM consists of a cryptographic key pair. You publish the public key on the Internet and you use the private key to sign headers of your outbound emails. This signing is done on the sending server. So unless Klaviyo is using Google servers to relay your messages, those messages are not being DKIM signed by Google.
How does the DKIM from SendGrid prevent me from spoofing my email adress?

How does the DKIM from SendGrid prevent me from spoofing my email adress?


By : Amey Pakhare
Date : March 29 2020, 07:55 AM
I hope this helps . It is important to understand that DKIM is based on public key cryptography. That means that a pair of keys is involved - a private key and a public key.
In this case, Sendgrid keeps possession of the private key, and provides you with the public key as a DNS TXT record to be published by you in DNS.
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