feat(vault): add mailgun_sandbox as backup for smtp2go_mc4

- domain sandboxa4549b6ba4654d379af3765fcdde98a2.mailgun.org, login mc_agents@..., api dc40... / sending_key 61c1...
- 4 authorized recipients verified 2026-09-03: alice_mc_claw@outlook.com, eric.chang@kumon-km.com.tw, mc@mc4.us, chang0206@gmail.com (limit 5)
- role backup, note SMTP 421 requires activation, API works
This commit is contained in:
XiaoNan
2026-09-03 11:01:29 +08:00
parent ec36a1e16f
commit 9913e88b27
+645 -554
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