An increasing number of services are explicitly prohibiting the use of disposable email addresses, including those from SimpleLogin. This means that Proton Mail cannot be used for those services unless the direct, unhidden address is exposed to those services. This is eroding the value of this feature.

A recent support email from one of these services stated it clearly:

"After reviewing, the email domain, passmail.net is using simplelogin.co mail server and is a disposable email service. We do not allow email changes/signup to [name of service] using a disposable email address."

I use this type of alias to ensure each service I use has a distinct point of contact. It's a means of detection, to determine who is abusing my trust. I won't drop an address unless I need to sever a source of confirmed spam or abuse. In essence, they're only "disposable" in that they use the same servers as email addresses created specifically to be thrown away once they've served their purpose. If my aliases are disallowed on that basis, then I need another solution, one which operates the same way as SimpleLogin aliases, but without being (inaccurately) identified as a "disposable" address.