v2.0.0

2.0.0 (2026-08-15)

⚠ BREAKING CHANGES

• Node.js 22.19.0 or newer is now required. The previous range claimed 14 and above, which no longer holds once mailauth is up to date.

Features

• dns: accept a promise-based custom DNS resolver (4cf3466)
• dns: accept a promise-based custom DNS resolver (a85d4cd)
• dns: allow declaring local NAT64 prefixes (202a5dd)
• dns: validate IPv4 addresses carried by IPv6 transition addresses (e452eec)
• require Node 22.19.0 and refresh dependencies (fdded42)
• validate every connection address, migrate internals to async/await (aa9129a)

Bug Fixes

• dns: enforce ignoreIPv6 for every address, not just lookups (30a0028)
• dns: give an address lookup failure one wording (a1c041a)
• dns: keep judging the address a declared NAT64 prefix matches (10fe9b2)
• dns: let a declared prefix cover the RFC 8215 NAT64 range (776c6f7)
• dns: report an IPv6-only host accurately under ignoreIPv6 (64f145f)
• dns: validate only canonical IP literals (e6c928d)
• npm: publish only lib, not the whole repository (55b23ab)
• prevent unhandled socket error events and crashes on malformed MX responses (b2d7892)
• resolve-ip: tolerate MX entries without address arrays (d8fbead)