Hi, thank you very much for your question!

1. Please check and make sure the email address you sent to is the task mailbox shown in the Settings page of your Doit.im account.
2. Check your web version https://i.doit.im/ to see if the mailed task is shown there.
3. Check your iPhone or desktop version to see if the mailed task is there.
4. Could you please tell us what email client you used for sending the mail?

Look forward to your reply so that we may better check and solve the problem.
Nice day!