SMTP connection from lost

could someone help me decipher this please. Looking at part 2 of the log file, I guess someone was trying to connect to the server using info, as thier login credentials, which doesn't exists so hence the failure. But i'm struggling to understand this first part.


2017-10-19 22:01:52 SMTP connection from [xxx.xxx.xxx.xxx]:5143 (TCP/IP connection count = 1)
2017-10-19 22:01:52 SMTP connection from xxx-xxx-xxx-xxx.static.asianet.co.th [xxx.xxx.xxx.xxx]:5143 lost
2017-10-19 22:01:53 SMTP connection from [xxx.xxx.xxx.xxx]:5262 (TCP/IP connection count = 1)
2017-10-19 22:02:48 H=xxx-xxx-xxx-xxx.static.asianet.co.th (pta-ad.domain) [xxx.xxx.xxx.xxx]:5262 sender verify fail for : The mail server could not deliver mail to test@co.uk.  The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.
2017-10-19 22:02:48 H=xxx-xxx-xxx-xxx.static.asianet.co.th (pta-ad.domain) [xxx.xxx.xxx.xxx]:5262 F= rejected RCPT : Sender verify failed
2017-10-19 22:03:02 SMTP connection from [xxx.xxx.xxx.xxx]:15734 (TCP/IP connection count = 3)





2017-10-19 22:03:25 dovecot_login authenticator failed for xxx-xxx-xxx-xxx.static.asianet.co.th (pta-ad.domain) [xxx.xxx.xxx.xxx]:15734: 535 Incorrect authentication data (set_id=info)
2017-10-19 22:05:33 SMTP command timeout on connection from xxx-xxx-xxx-xxx.static.asianet.co.th (pta-ad.domain) [xxx.xxx.xxx.xxx]:5262
2017-10-19 22:06:10 SMTP command timeout on connection from xxx-xxx-xxx-xxx.static.asianet.co.th (pta-ad.domain) [xxx.xxx.xxx.xxx]:15734
2017-10-19 22:06:10 H=xxx-xxx-xxx-xxx.static.asianet.co.th (pta-ad.domain) [xxx.xxx.xxx.xxx]:15734 Warning: "Connection Ratelimit - xxx-xxx-xxx-xxx.static.asianet.co.th (pta-ad.domain) [xxx.xxx.xxx.xxx]:15734 because of notquit: command-timeout (2.0/1h max:1.2)"

SMTP connection from lost

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