Thanks for your response. THe sending client is an automated script via sendmail. Below are the relevant parts of the headers of the received mail.

```
Delivered-To: [email protected]
From: [email protected]
Date: Sun, 21 Dec 2025 17:39:50 +0000
Message-ID: <[email protected]>
To: [email protected]
Subject: Daily update
```

Dan

On 21/12/2025 17:19, Newcomer01 via clamav-users wrote:
which mail client you are using? You must have an client which provide the in your case required fields, your client must be support to read out message mime headerĀ e.g. "From:"

Von / From: Daniel Colquitt Via Clamav-Users <mailto:[email protected]>
An / To:        Newcomer01 <mailto:[email protected]>
CC / CC:        Daniel Colquitt <mailto:[email protected]>
Gesendet / Sent:        Sonntag, Dezember 21, 2025 um 12:02 (at 12:02 PM) +0100
Betreff / Subject:      [clamav-users] clamav-milter whitelist

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature

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