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My mail server is giving me problems. It can send emails but it rejects external mails. When I looked at Event Log Viewer, i saw the following and extracted it:
Feb 24 08:20:24 mtb postfix/smtpd: connect from mail-lpp01m010-f42.google.com[22.214.171.124]
Feb 24 08:20:27 mtb postfix/smtpd: setting up TLS connection from mail-lpp01m010-f42.google.com[126.96.36.199]
Feb 24 08:20:35 mtb postfix/smtpd: warning: network_biopair_interop: error reading 11 bytes from the network: Connection reset by peer
Feb 24 08:20:35 mtb postfix/smtpd: SSL_accept error from mail-lpp01m010-f42.google.com[188.8.131.52]: -1
Feb 24 08:20:35 mtb postfix/smtpd: lost connection after STARTTLS from mail-lpp01m010-f42.google.com[184.108.40.206]
Feb 24 08:20:35 mtb postfix/smtpd: disconnect from mail-lpp01m010-f42.google.com[220.127.116.11]
I then get a notification that email has been rejected by the receipient domain.