mail-mcp v0.1 — Rust MCP email server

Phase A: mail_send + mail_inbox_list + mail_inbox_read. Replaces
a legacy mail CLI script with a typed MCP server. Outbound guarantees Date,
Message-ID (own-domain), User-Agent, MIME-Version, multipart/alternative
for HTML+text, multipart/mixed for attachments, In-Reply-To +
References for threading.

Single account in v0.1 (default_account from config). Phase B adds
multi-account + threading + search; Phase C adds mark + attachments +
reply helper.

Stack: rmcp 0.1 (matches aldabra), lettre 0.11 + tokio-rustls, async-imap
0.10, mail-parser 0.9. Stderr-only logging (stdout is the MCP transport).

Smoke verified 2026-05-21: send -> land -> read user@example.com round
trip, DKIM-Signature + Authentication-Results pass at the rspamd relay.

.gitignore

@@ -0,0 +1,14 @@
+target/
+**/*.rs.bk
+Cargo.lock.bak
+
+# Local config files MUST NOT be tracked — they carry credentials.
+config.toml
+**/config.toml
+!config.example.toml
+
+# Editor / OS junk
+.idea/
+.vscode/
+*.swp
+.DS_Store