net/mail: parse ipv6 in addresses according to RFC 5321.

The new domain-literal support missed that IPv6 addresses need to be
prefixed with "IPv6:".

The IPv6-address-literal Specification, defined in RFC 5321 Section 4.1.3,
outlines the format for IPv6 address literals:
https://datatracker.ietf.org/doc/html/rfc5321#section-4.1.3

Good news, the IANA has registered no other Address Literal Tags.

Updates #60206

Change-Id: I7796b0f78e386a6509e793a9db98404934797722
GitHub-Last-Rev: b65fdec3e96da76f16b42eb761d6aafd3b476377
GitHub-Pull-Request: golang/go#69461
Reviewed-on: https://go-review.googlesource.com/c/go/+/613335
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2 files changed
tree: fceef850fed4c2562ea66619f8b793e02b0f49d9
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
README.md

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