DNS Setup for 1&1 IONOS
Log in to your 1&1 IONOS account.
Click the Manage Domains under Domains section.
On the Domain Center page, find the appropriate domain and then click the Panel (v) control for that domain. Click the Edit DNS Settings under Domain Settings section.
To create a new record, select the CNAME option from the Type drop-down menu.
Enter the Hostname we recommend into the Prefix field.
Note: You may only need to add the first part of the recommended hostname and not your full domain name to your DNS records as your provider may automatically add it.
Enter the Value that we advise for your CNAME record into the Value field.
Click the Add button.
Click the Save button.
You can find the "Hostname" and "Value" under the Settings > Sender Domains section of your SMTP2GO Dashboard.
Repeat steps 4,5 and 6 for each required CNAME record.