Configure your DNS
DNS records tell mail senders which service handles incoming email for the domain. They are usually set at the registrar from which you acquired your domain.
Here are somes guides that might help you:
Alternatively we can do that setup for you if you subscribe to a premium plan. We'll need your registrar credentials so we can access your DNS editor.
Try with an empty field instead, or with your domain name.
Add MX record
Login to your domain registrar, delete any existing MX records in the DNS editor, and add this one.
Host / Name Value Priority @ mail.postale.io. 10
Add TXT records
Delete any existing TXT records for SPF, DMARC, and DKIM, and add these three. They will help your emails avoid SPAM folders.
Please specify a domain for the DKIM record:
Host / Name Value @ v=spf1 mx ~all _dmarc v=DMARC1; p=none;