DKIM and bounce verification

[samuelsancho]

Hi all, as I understand DKIM uses from: field to create the hash that later will be used for recipient. Bounce Verification inserts a tag inside from: field too. So I supposed Ironport first insert the Bounce Verification tag and then create DKIM hash, because if you create DKIM first then  Bounce Verification modifies the message and the hash will not be valid.

Is this correct?

thank you

Regards

Samuel

[viahmed · Accepted solution]

Greetings,

BV does not modify the FROM header, only modify field. So it doesn't impact DKIM signing. The DKIM signature is inserted in the email as a DKIM signature header and the email is transmitted. The receiving MTA extracts the DKIM signature from the header and the claimed sending domain (via the Sender: or From: header) from the email. The public key is retrieved from the claimed signing domain which is extracted from DomainKeys or DKIM signature header fields.

Hope answered your question.

Cheers,

Viquar Ahmed

Customer Support Engineer

[samuelsancho]

Than you Viquar

2011/2/21 viahmed

samuelsancho,

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