Transcript of session follows.
Out: 220 yetongge.top ESMTP Postfix
In: EHLO ptr-hk-103-86-76-148.qcloudmail.com
Out: 250-yetongge.top
Out: 250-PIPELINING
Out: 250-SIZE 102400000
Out: 250-VRFY
Out: 250-ETRN
Out: 250-STARTTLS
Out: 250-AUTH PLAIN LOGIN
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250-DSN
Out: 250-SMTPUTF8
Out: 250 CHUNKING
In: STARTTLS
Out: 454 4.7.0 TLS not available due to local problem
Session aborted, reason: lost connection
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