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    Recipient address rejected: Service is unavailable (try later)

    Here a screenshot of the configuration panel. At the moment I don't have a subscription but if I manage to make everything work, I think of course going to purchase.
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    Recipient address rejected: Service is unavailable (try later)

    Thanks for your reply. I have disable greylisting for ipv4 and ipv6 and the the message is still there. If it was greylisting, wouldn't it say "greylist" in the error message? (Email temporarily rejected by greylisting)
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    Recipient address rejected: Service is unavailable (try later)

    Hello, Sorry for my English. I have set up a small Proxmox cluster and randomly on certain destination e-mail addresses I have the Recipient address rejected: Service is unavailable (try later) error However, according to the sender, the error does not appear. Greylisting is OFF. Do you have...
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