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Firefox Adds Masking to Better Help With Email Spam and Tracking
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A place to discuss the news and latest developments on the open-source browser Firefox
If you use fastmail and a custom domain it automagically lets you reply to email from the email they sent you. i.e. if you have COMPANYA@mydomain.com and you reply to one of their emails it comes from COMPANYA@mydomain.com
Most paid email providers let you setup a custom domain with a catch all address, its worth it. Not all have this handy reply email feature, and you have to configure a custom response address, annoying it but works too
SimpleLogin/ProtonPass also let's you reply to any email from your alias, but you need to set up a reverse alias if you aren't replying.