The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720 [msa.batol.net 163.13.224.20: generic::failed_precondition: connect error (0): error]
Final-Recipient: rfc822; cheng9443@msa.batol.net
Action: delayed
Status: 4.4.1
Diagnostic-Code: smtp; The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720
[msa.batol.net 163.13.224.20: generic::failed_precondition: connect error (0): error]
Last-Attempt-Date: Mon, 30 Apr 2018 21:52:23 -0700 (PDT)
Will-Retry-Until: Tue, 01 May 2018 19:05:30 -0700 (PDT)