Unable to convert item when message digital signed

Hi,

All message digital sign, vault can't convert. Our Server are not connected to the internet. Is there a way to prevent Vault from trying to convert this message?

Log Name:      Veritas Enterprise Vault Converters
Source:        Enterprise Vault Converters
Date:          2024-09-26 14:15:21
Event ID:      29132
Task Category: Storage Archive
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      EVSERVER1.domain.local
Description:
Unable to convert item content 
 
Reason: Unable to convert item as there is no converter available for the document type, and it is not recognised as text.      (0xc0041afb) 
Supplementary Info: File type is unknown (16777216) [FOTC] 
 
Item: SA:-0 
Subject: smime.p7s 
Attachment:  
Type: p7s 
Vault ID: 1F954F4386BC31C409A8D984EE59BF0271110000EXCHEVARQ01 
SaveSet ID: 202409267356516~202406260939120000~Z~812D207A35F1C9B47EAF47B73D527FB1 
Attachment ID: 3 
Archive Name: 1F954F4386BC31C409A8D984EE59BF0271110000EXCHEVARQ01 
Archive Date: 2024-09-26 13:15:00 
 
This item will be archived without a preview being available to the web application and the  content will not be indexed. It is not possible to search on the content but the item can be restored  as normal 

For more information, see Help and Support Center at http://telemetry.community.veritas.com/entt?product=ev&language=english&version=15.0.0.0&build=15.0.0.1216&error=V-437-29132
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Enterprise Vault Converters" />
    <EventID Qualifiers="32772">29132</EventID>
    <Level>3</Level>
    <Task>39</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2024-09-26T13:15:21.896402500Z" />
    <EventRecordID>136556</EventRecordID>
    <Channel>Veritas Enterprise Vault Converters</Channel>
    <Computer>EVSERVER1.domain.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Unable to convert item as there is no converter available for the document type, and it is not recognised as text.      (0xc0041afb)</Data>
    <Data>File type is unknown (16777216) [FOTC]</Data>
    <Data>SA:-0</Data>
    <Data>smime.p7s</Data>
    <Data>
    </Data>
    <Data>p7s</Data>
    <Data>1F954F4386BC31C409A8D984EE59BF0271110000EXCHEVARQ01</Data>
    <Data>202409267356516~202406260939120000~Z~812D207A35F1C9B47EAF47B73D527FB1</Data>
    <Data>3</Data>
    <Data>1F954F4386BC31C409A8D984EE59BF0271110000EXCHEVARQ01</Data>
    <Data>2024-09-26 13:15:00</Data>
  </EventData>
</Event>