<div dir="ltr">Thanks, Marin for bringing this up. Same problem for me.<br></div><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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        <td style="width:55px;padding-top:13px"><a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" target="_blank"><img src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif" alt="" width="46" height="29" style="width: 46px; height: 29px;"></a></td>
                <td style="width:470px;padding-top:12px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Virus-free. <a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" target="_blank" style="color:#4453ea">www.avast.com</a>
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</table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 23 Sep 2020 at 10:54, Martin Koppenhoefer <<a href="mailto:dieterdreist@gmail.com">dieterdreist@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>It's been some weeks now that I get this kind of reply for every message that I write to tagging. Can an admin please remove the address <a href="mailto:jimutt@hey.com" target="_blank">jimutt@hey.com</a> from the list recipients? Thank you.</div><div><br></div><br><p><b><font size="3" face="Arial" color="#000066">haystack-mail-home-inbound-postfix-0.localdomain rejected your message to the following email addresses:</font></b></p><span>
<font size="2" face="Tahoma" color="#000000"><p><a href="mailto:jimutt@hey.com" target="_blank">jimutt@hey.com</a><br>
</p></font>
<font size="3" face="Arial" color="#000000">The address you sent your 
message to wasn't found at the destination domain. It might be 
misspelled or it might not exist. Try to fix the problem by doing one or
 more of the following:<ol><li>Send the message again, but before you 
do, delete and retype the address. If your email program automatically 
suggests an address to use, don't select it.</li><li>Clear the recipient AutoComplete cache in your email program by following the steps in this article: <a href="https://go.microsoft.com/fwlink/?LinkId=389363" target="_blank">Status code 5.1.1</a>. Then resend the message, but before you do, be sure to delete and retype the address.</li><li>Contact
 the recipient by some other means (by phone, for example) to confirm 
you're using the right address. Ask them if they've set up an email 
forwarding rule that could be forwarding your message to an incorrect 
address.</li></ol><br>
</font>
</span><font size="2" face="Tahoma" color="#000000"><br>

<p><b>haystack-mail-home-inbound-postfix-0.localdomain gave this error:<span><br>
<<a href="mailto:jimutt@hey.com" target="_blank">jimutt@hey.com</a>>: Recipient address rejected: User unknown <br>
</span></b></p>

</font>
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</blockquote></div>