Thanks for sharing you insights about our email service, @em41,
For now, QuickBooks can only support 1AND1.com. If IONOS is using the same ISP, this is how you can set it up in QuickBooks:
- Go to the Edit menu and then Preferences.
- Once done, click on Send Forms then My Preferences.
- Choose Web Mail then press Add.
- Enter the Email ID and Email Provider as Others.
- For the SMTP Server Details, add smtp.1and1.com.
- Add 587 for the Port.
- Once done, press OK.
![](https://lithium-response-prod.s3.us-west-2.amazonaws.com/intuit.response.lithium.com/RESPONSEIMAGE/a6c25367-97ca-4e35-b84f-4b15c1a7c595.default.PNG)
When you send invoices, the system will ask for the app password from your email service. You may contact the email provider to get help generating the password for you.
To learn more about our emailing service and support ISP's, please see the following article: Connect your email to QuickBooks Desktop
If you have anymore questions about the setup, please let me know in the comment below. Have a good one!