Don’t know if you already solved this but this message comes from your mailserver and means that your mailserver doesn’t allow you to use the specified sender address you entered together with the credentials you gave. Make sure you have a user with the correct mail address you want to use in Zammad set up on your mailserver.
Yes awedor, I am still waiting the answer from hostway cause our conclution was that the problem is from the server mail, cause with gmail I didn’t have any problem. I will update this ticket with the finish solution for improve the zammad community.
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