DKIM Tag not match with DNS Config

[MSabino85]

Hello everyone.

In the DNS configuration I have to validate the DKIM record postal-gVxVcR._domainkey.mta01.mydomain.com

When I send a test email, the domain it sends and validates against is rp.mta01.mydomain.com
Is it correct? or something in the DNS configuration I omitted to configure?

The DKIM signature tag is s=postal, shouldn't it be postal-gVxVcR?
To force this, in postal.yml I put dkim_identifier = postal-gVxVcR, it works.
but when doing this in the DNS configuration web, instead of validating against postal-gVxVcR._domainkey.mta01.mydomain.com, it tries to validate against postal-gVxVcR-gVxVcR._domainkey.mta01.mydomain.com
Concatenates twice the tag suffix (-gVxVcR)

With dkim_verify_prefix = postal-gVxVcR I don't notice any difference commenting it out or leaving it in.

I tried verifications with both use_local_ns_for_domain_verification: true and false with no positive results.

[willpower232]

Presumably postal-gVxVcR._domainkey.mta01.mydomain.com is a TXT record with the DKIM value from the domains page and Postal thinks all your DNS is valid and you have also added a return path domain with psrp or whatever configured?

I just sent myself an email from the web ui and got headers like this

Authentication-Results: spf=pass (sender IP is 12.34.567.89)
 smtp.mailfrom=psrp.testdomain.com; dkim=pass (signature was verified)
 header.d=testdomain.com;dmarc=bestguesspass action=none
 header.from=testdomain.com;compauth=pass reason=109

Received-SPF: Pass (protection.outlook.com: domain of psrp.testdomain.com
 designates 12.34.567.89 as permitted sender) receiver=protection.outlook.com;
 client-ip=12.34.567.89; helo=postaldomain.com; pr=C

Resent-Sender: szfa4f@psrp.testdomain.com

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=testdomain.com; s=postal-xrOULx; t=1715849512;
 bh=SiHcbximZ1Bf69t5kpZBVJmMY0kHEebNxSEjIg8gBRY=; h=date:from:to:message-id:subject:mime-version:content-type:content-transfer-encoding;
 b=A42Htw51sLyuDKtUqBdOzkDvOfWoCTCUrWZpQ3uz270JiiwvhVufEo5jEzPqOsgeRs+fphXshzRRV1QBPEJapo1IZhfQN1n5Jj
 +WwQ3zohXPeB1G09ujk1LjA0mwG5+grbVoy7d0KF2Hpmw5mwe3VzfnG13xtlef7MZtSgm+cVg=

X-Postal-MsgID: DcGomzKz7Z6N

Received: from web-ui (987.65.43.21 [987.65.43.21]) by Postal with HTTP; Thu, 16 May 2024 08:51:52 +0000

Date: Thu, 16 May 2024 09:51:52 +0100

From: test@testdomain.com

Message-ID: <7d9d4794-9b1e-4923-81f5-72bfd32149a5@rp.postaldomain.com>

Subject: Test Message at May 16, 2024 09:51

Return-Path: szfa4f@psrp.testdomain.com
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