remove anonaddy

[milachevalier]

Same reasons as #846 in principle.

Unlike simplelogin domains, anonaddy implements unique subdomains for each user, it would be easier for webmasters to block subdomains that are misusing the service. From what I can see there is a hard limit to shared aliases that each user can use in the free tier making it unlikely to be abused beyond an extent.

AnonAddy's free plan is for receiving only. You cannot reply to messages. This is essentially the same as disposable email.

[willbrowningme]

Thanks @milachevalier I've opened a pull request here. AnonAddy is not a disposable email provider.