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A comment on Another free CA as an alternative to Let's Encrypt. Parent comment

Re:Another free CA as an alternative to Let's Encrypt by 1vuio0pswjnm7 on Monday November 23, 2020 @02:48PM (#25190866)
"Why would you necessarily buy a domain?"

E-mail is one example. Technically domain names are not necessary to successfully send own mail with own server, i.e., without using a 3rd party email provider. E-mail predates DNS; mail software has always supported IP addresses. However, today, the dominant 3rd party e-mail providers will reject mail coming from an IP address not associated with a domain name.

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Re:Another free CA as an alternative to Let's Encrypt by hackerbee on Monday November 23, 2020 @05:37PM (#25192789)
The patchwork of anti-phishing and anti-spamming measures like SPF and DKIM require DNS TXT records. Allowing mail from an IP address would likely be used almost exclusively for spamming.
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