On 04/12/2020 16:35, Mary via mailop wrote:
Hello,
Is it common to see emails from Microsoft having a bad DKIM signature?
Here is an example:
opendkim[614]: B78DA4A48C: external host
mail-bn8nam11on2062.outbound.protection.outlook.com attempted to send as
accountprotection.microsoft.com
opendkim[614]: B78DA4A48C: bad signature data
postfix/cleanup[188082]: B78DA4A48C: milter-reject: END-OF-MESSAGE from
mail-bn8nam11on2062.outbound.protection.outlook.com[40.107.236.62]: 5.7.0 bad DKIM signature
data; from=<account-security-nore...@accountprotection.microsoft.com> to=<reducted>
proto=ESMTP helo=<NAM11-BN8-obe.outbound.protection.outlook.com>
It's not just you. I have seen valid (tested with other DKIM
implementations) DKIM signatures from Microsoft fail with OpenDKIM with
bad signature data, pretty much like that.
I've been assuming MS are using an algorithm OpenDKIM doesn't support,
but I've not gotten around to diagnosing it more.
Cheers,
Steve
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