A(对象+allowHalfOpen+starttls): ❌ This WritableStream is currently locked to a writer.
B(字符串+allowHalfOpen+starttls): ❌ This WritableStream is currently locked to a writer.
C(对象不带allowHalfOpen): ❌ This WritableStream is currently locked to a writer.
D(465 secureTransport:on): banner=220 newxmesmtplogicsvrszb43-0.qq.com XMa (code 220)