Upper Room daily devotional
Inward Outward: a ministry of Church of the Savior in Washington, D.C.
One Spirit Learning Alliance – this is an interfaith resource
Spirituality and Practice
This website doesn’t have a daily email you can subscribe to, but they do have many online resources that you might find helpful as you nurture your spiritual practice. They also have online courses you can subscribe to, which do include a daily email component.
The Thoughtful Christian
This is another great resource where you might find an interesting Lenten book or study.