Hi {{user.name or ""}} Your email cannot be sent to {{contact.email}} from your alias {{alias.email}}. Can you please verify {{contact.email}} is a valid address? Usually this is because the DNS record of {{contact_domain}} does not exist. You can check its DNS record on any DNS checker websites, for example https://mxtoolbox.com/SuperTool.aspx Please let us know if you have any question. Best, SimpleLogin team.