Keep a published rule when some invitation emails already went out, and only set Reply-To when the inviter address is a mailbox.

tests/unit/ruleStakeholderInviteMail.test.ts

@@ -1,13 +1,47 @@
 import { describe, expect, it } from "vitest";
 import {
   RULE_STAKEHOLDER_INVITE_LOGO_PATH,
+  RULE_STAKEHOLDER_INVITER_FALLBACK,
   buildRuleStakeholderInviteMail,
   ruleStakeholderInviteCopyUrl,
+  stakeholderInviteInviterLabel,
+  stakeholderInviteReplyTo,
 } from "../../lib/server/ruleStakeholderInviteMail";
 
 const VERIFY_URL =
   "https://communityrule.info/api/invites/rule-stakeholder/verify?token=abc";
 
+describe("stakeholder invite reply address", () => {
+  it("uses a mailbox as Reply-To and keeps a missing address out of the header", () => {
+    expect(stakeholderInviteReplyTo("  Maya@Example.org ")).toBe(
+      "maya@example.org",
+    );
+    expect(stakeholderInviteReplyTo(RULE_STAKEHOLDER_INVITER_FALLBACK)).toBe(
+      undefined,
+    );
+    expect(stakeholderInviteReplyTo("CommunityRule")).toBe(undefined);
+  });
+
+  it("names a missing inviter without turning the label into an address", () => {
+    expect(stakeholderInviteInviterLabel("")).toBe(
+      RULE_STAKEHOLDER_INVITER_FALLBACK,
+    );
+    expect(stakeholderInviteInviterLabel("Maya@Example.org")).toBe(
+      "maya@example.org",
+    );
+    const mail = buildRuleStakeholderInviteMail({
+      to: "rosa@example.org",
+      verifyUrl: VERIFY_URL,
+      origin: "https://communityrule.info",
+      communityName: "Juniper Street Food Share",
+      inviterEmail: RULE_STAKEHOLDER_INVITER_FALLBACK,
+    });
+    expect(mail.text).toContain(
+      `${RULE_STAKEHOLDER_INVITER_FALLBACK} sent the invitation.`,
+    );
+  });
+});
+
 describe("ruleStakeholderInviteCopyUrl", () => {
   it("adds copy=1 to the invitation link", () => {
     expect(ruleStakeholderInviteCopyUrl(VERIFY_URL)).toBe(