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Re:Ask HN: Do I need to register a lot of redundant domains? by upatricck on Sunday March 22, 2020 @03:01AM (#22653268)
I think many domains for one company might lead to confusion to users.

If I received an email from mail-fb.io for example it wouldn't look legit to me. Any of their subdomain would be good.

Re:Ask HN: Do I need to register a lot of redundant domains? by Kkoala on Sunday March 22, 2020 @09:23AM (#22654771)
That's funny because FB uses facebookmail.com for some communication for example, recruiting