tao12345666333 commented on issue #1738:
URL: 
https://github.com/apache/apisix-ingress-controller/issues/1738#issuecomment-1479067168

   I don't know exactly what's going on here.
   
   Can you provide more information? For example, what is your server?
   
   In addition, I suggest that you can use `tcpdump` to capture packets to 
check whether there is any difference when using APISIX and NGINX.
   
   FYI:  
   * 
https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118016-troubleshoot-esa-00.html
   * 
https://learn.microsoft.com/en-us/exchange/mail-flow/test-smtp-telnet?view=exchserver-2019
   * 
https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/113423-asa-esmtp-smtp-inspection.html


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