FastMail. One of the best & most flexible email services.

You get an enormous amount of services when you have a Fastmail account. One of the things I like a lot is the ability to send email as if from other addresses that I own. I have purchased some domains with forwarding only, so I must have a site I can use to write from these addresses. Fastmail also allows a tremendous amount of aliases at their various addresses, so it is possible to be, for example, John@ many different addresses, or to have one for friends, one for business, one for commerce. Their reliability is top-notch. I have been with them for years and never remember a down time, which is pretty amazing. If there was one it was literally only minutes long. The pricing is flexible too, depending on how much storage you might need. I am always surprised at people who moan about free services shutting them out when they have not been used. That is what happens with FREE, but for very little money you can get an account which has no login requirements. You really can't go wrong with this service!