feat: support setup with only an IPv4 address, but no domain#919

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missytake wants to merge 14 commits intomainfrom

ipv4-only-retry

Commits on May 6, 2026

Commits on May 8, 2026

retain "config.mail_domain" as the domain part of @ email addresses, so for ipv4 relays "[1.2.3.4]" and introduce config.ipv4_relay and config.mail_domain_bare helpers.
hpk42
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