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This can be removed using resource files (please keep in mind that depending on the account plan the option might not be available), please view page 46: https://support.docusign.com/s/document-item?bundleId=docusign-email-resource-file-guide&topicId=docusign-email-resource-file-guide.pdf&_LANG=enus
Let us know if you need further assistance with this.
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Nathaly | DocuSign Community Moderator
"Select as Best" below if you find the answer a valid solution to your issue!
Remove that block of all the templates on the resource file, you should find it 32x:
   Conditional:ShowIntroductionSender]]<table role="presentation" border="0" cellspacing="0" cellpadding="0"><tr>        Â
    t;Conditional:ShowIntroductionSender]]<td style="padding-bottom:20px;">  Â
  ÂConditional:ShowIntroductionSender]]   <div style="font-family:Helvetica,Arial,Sans Serif;font-weight:bold;line-height:18px;font-size:15px;color:#333333;">
  33Conditional:ShowIntroductionSender]]     ucData:SenderName]]
  atConditional:ShowIntroductionSender]]   </div>
  ]]Conditional:ShowIntroductionSender]]   naConditional:SenderEmail]]<div style="font-family:Helvetica,Arial,Sans Serif;line-height:18px;font-size:15px;color:#666666;">foData:SenderEmail]]</div></td>
  ]&Conditional:ShowIntroductionSender]]</tr></table>