DKIM: Invalid signature record

Hi,

We are using SmarterMail 16.3.6989 and we are configuring DMIM using the default parameters:

dkimCanonicalizationAlgorithm_Body: relaxed
dkimCanonicalizationAlgorithm_Header: relaxed
dkimHashAlgorithm: sha256
dkimHeaderFieldOption: allnotspecified
dkimHeaderFields: return-path:received:comments:keywords:bcc:resent-bcc:dkim-signature

It works fine with gmail. However, with other servers it does not (e.g. Zoho and at least another one). Zoho by default does not accept the messages signed by SmarterMail. Zoho replies with:

Could not deliver message to the following recipient(s):
Failed Recipient: name@xpto.com
Reason: Remote host said: 554 5.2.3 MailPolicy violation Error delivering to mailboxes

We complain with zoho and the answer was that the sender domain (fkmotors.pt) fails DKIM validation.

We with listed the domain in Zoho and now we can see more details in the headers of messages:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=xpto.com; s=8d6a60b5130b8db;
h=content-type:mime-version:message-id:reply-to:date:subject:to
:from;
bh=iY...580=;
b=XO...0n
6M...vlF
ftW...Pk
Yp...AVY
7vq...V0
6Wp...9jLw==
...
...
X-ZohoMail-DKIM: fail (Invalid signature record: Syntax error in field name: to
)

Does anyone has the same problem? Do you have any suggestions to solve this issue?

Thanks,

António

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