Mail conversation was terminated after 250 Queued mail for delivery，and the sending mail server keeps sending the same email.
2021-03-13 10:35:13,937 ERROR Zipper - Unable to view zipped bytes. Unexpected record signature: 0XE011CFD0
2021-03-13 10:35:13,979 ERROR Zipper - Unable to view zipped bytes. Unexpected record signature: 0XE011CFD0
2021-03-13 10:35:13,963 ERROR Zipper - Unable to view zipped bytes. Unexpected record signature: 0XE011CFD0
2021-03-13 10:35:13,994 ERROR Zipper - Unable to view zipped bytes. Unexpected record signature: 0XE011CFD0
2021-03-13 10:35:14,014 ERROR Zipper - Unable to view zipped bytes. Unexpected record signature: 0XE011CFD0
2021-03-13 10:35:14,016 ERROR Zipper - Unable to view zipped bytes. Unexpected record signature: 0XE011CFD0
2021-03-13 10:35:09,520 - [ 4046] ************ New connection from: 202.108.3.167:25
2021-03-13 10:35:09,714 - [ 4046] C --> HELO mail3-167.sinamail.sina.com.cn
2021-03-13 10:35:09,714 - [ 4046] S <-- 250 202.108.3.167. Pleased to meet you
2021-03-13 10:35:09,905 - [ 4046] C --> MAIL FROM:<longshiXXXXXX@sina.com>
2021-03-13 10:35:09,906 - [ 4046] S <-- 250 OK
2021-03-13 10:35:10,099 - [ 4046] C --> RCPT TO:<jeffrey_shen@mydomain.com>
2021-03-13 10:35:10,100 - [ 4046] S <-- 250 OK
2021-03-13 10:35:10,298 - [ 4046] C --> DATA
2021-03-13 10:35:10,298 - [ 4046] S <-- 354 Start mail input; end with <CRLF>.<CRLF>
2021-03-13 10:35:15,896 - [ 4046] S <-- 250 2.6.0 Queued mail for delivery
2021-03-13 10:35:16,097 - [ 4046] ~~~~~~~~~~~~ Connection Terminated (6577:45) Unexpected input termination. Connection terminated without a graceful QUIT.
2021-03-13 10:35:09,523 - [ 4047] ************ New connection from: 202.108.3.165:25
2021-03-13 10:35:09,707 - [ 4047] C --> HELO mail3-165.sinamail.sina.com.cn
2021-03-13 10:35:09,708 - [ 4047] S <-- 250 202.108.3.165. Pleased to meet you
2021-03-13 10:35:09,891 - [ 4047] C --> MAIL FROM:<longshiXXXXXX@sina.com>
2021-03-13 10:35:09,891 - [ 4047] S <-- 250 OK
2021-03-13 10:35:10,074 - [ 4047] C --> RCPT TO:<tingting_wang@mydomain.com>
2021-03-13 10:35:10,075 - [ 4047] S <-- 250 OK
2021-03-13 10:35:10,264 - [ 4047] C --> DATA
2021-03-13 10:35:10,264 - [ 4047] S <-- 354 Start mail input; end with <CRLF>.<CRLF>
2021-03-13 10:35:14,860 - [ 4047] S <-- 250 2.6.0 Queued mail for delivery
2021-03-13 10:35:15,053 - [ 4047] ~~~~~~~~~~~~ Connection Terminated (5530:45) Unexpected input termination. Connection terminated without a graceful QUIT.
2021-03-13 10:35:10,341 - [ 4048] ************ New connection from: 202.108.3.165:25
2021-03-13 10:35:10,527 - [ 4048] C --> HELO mail3-165.sinamail.sina.com.cn
2021-03-13 10:35:10,527 - [ 4048] S <-- 250 202.108.3.165. Pleased to meet you
2021-03-13 10:35:10,713 - [ 4048] C --> MAIL FROM:<longshiXXXXXX@sina.com>
2021-03-13 10:35:10,713 - [ 4048] S <-- 250 OK
2021-03-13 10:35:10,900 - [ 4048] C --> RCPT TO:<beibei_liu@mydomain.com>
2021-03-13 10:35:10,901 - [ 4048] S <-- 250 OK
2021-03-13 10:35:11,089 - [ 4048] C --> DATA
2021-03-13 10:35:11,089 - [ 4048] S <-- 354 Start mail input; end with <CRLF>.<CRLF>
2021-03-13 10:35:14,884 - [ 4048] S <-- 250 2.6.0 Queued mail for delivery
2021-03-13 10:35:15,078 - [ 4048] ~~~~~~~~~~~~ Connection Terminated (4737:45) Unexpected input termination. Connection terminated without a graceful QUIT.
