I just sent a mail to another mailserver which expandes the adress to an address list where my own mail address is the recipient.
The sending of the message works, but the other server receives the following error messge from my mailcow server when sending my mail back to my email:
This is the mail system at host kxxxx.yyyy.ps-server.net.
I’m sorry to have to inform you that your message could not be delivered to one or more recipients. It’s attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system x.yyyyy@domain-a.biz (expanded from info@domain-b.de): host
mail.domain-c.de[xxx.yy.zzz.92] said: 554 5.7.1 This message does not
meet our delivery requirements (in reply to end of DATA command)
I checked the Rspamd interface and found this:
Is there any way to whitelist the server?