But why?
Spam. The volume, and the cost of the computing power required to remove it before it hits your mailbox. The larger the scale (Google, Microsoft) they can see the spam coming into their domains and other domains and see it is the same and delete it from all incoming at the same time.
I know years ago there was a free mailbox goldrush, I presume that failed because there wasn't a practical way to make an API pay so they resorted to making customers use webmail and Gmail pretty much cleaned out that market.
Most ISPs used free software, which then didn't scale. They then outsourced to Gmail for a while, then Yahoo for a while, but many are back in house.
It seems as if modern ISPs just resell wholesale services and running their own servers for their customers' benefit is too much like work requiring in-house IT that they'd rather dispense with.
They run their own networks at tens of gigabits which is complex enough. Running terabytes of data storage and the multi-site backups and looking after it, is not remotely the same business as providing a routable IP address to the internet.
Running email is a costly business, and getting it wrong and losing customers email is worse than not supplying the service. Especially when the likes of Google or Microsoft will sell you business grade email for £3+tax a month, or you can have advertising supported for free.
Most US providers provided only 1 mailbox even years ago, perhaps it was a UK oddity that every ISP gave you 10 or more mailboxes. Started with Demon internet giving you SMTP direct to your dial up host - wouldn't work today, your dial up link would be full of junk mail
23 years of broadband connectivity since 1999 trial - Live BQM
Edited by jchamier (Mon 17-Jul-23 13:22:15)