SimpleLogin is described as 'Open source solution to protect your personal email address. Generous free plan with uncapped bandwidth and infinite sends/replies, self-hostable, lot of powerful features, open roadmap, you can count on SimpleLogin to guard your email inbox' and is a very popular Anti-Spam tool in the security & privacy category. There are more than 100 alternatives to SimpleLogin for a variety of platforms, including Web-based, Google Chrome, SaaS, Mozilla Firefox and Android apps. The best SimpleLogin alternative is addy.io, which is both free and Open Source. Other great apps like SimpleLogin are AliasVault, Firefox Relay, TemporaryMail and MailDrop.
TempMailWeb - is a 100% free Temporary email service that allows you to receive an email at a temporary address that is self-destructed after a certain time period. It is also known by names like temp email, Temp mail, Disposable EMail, throwaway email mailbox, Disposable E-Mail...
Disposable temporary email addresses that you can use when signing up on websites to protect your identity and prevent your personal email address from being sold or spammed.
Gmailnator, Smartnator or Emailnator is a free service that allows getting instant temporary email it is also known as "tempmail", "10 minute mail", "throw away mail", "disposable mail", fake email, and "trash mail".
Stop giving out your real email address. The Inboxes App browser extension gives you temporary email addresses you can delete, saving your inbox from junk.
Simple free disposable email address service, unlimited free disposable email addresses. Create a new e-mail address whenever you need one. Maintain complete control over active addresses. Forwards all mail to your existing e-mail address. Never receive unwanted e-mail again.
Mail Relay is Privacy Portal's email privacy service. It enables you to hide your personal email from third-parties, thus protecting your identity online and helping you reduce your digital footprint.
Free temporary email to protect your privacy and from spam. Get a free disposable email address that you can use for any site or app. Stop advertisers from tracking your purchases, shopping habits, and website visits.
Minute Mailbox is a temporary email service that allows you to generate email IDs and receive emails right the way. You can get your temporary addresses for free with a click of the mouse and let them self-destruct after 24 hours.
Get all the spam, junk, advertising material delivered directly to your inboxes email address. Keep your private email for what's important, and use inboxes for anything else.
FakeMail is a free temporary email address generator and throwaway email service provider offering temporary, secure, anonymous, free, disposable email addresses where you can receive email temporarily but self-destructs after a certain time.
Control when you receive emails by creating custom aliases. Batch messages into daily, weekly or monthly digests.
India
United Kingdom
It has all the features I was looking for including E2EE for labels.