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  • If you get "XS"s in your telnet session with your smtp server (might be for STARTTLS commands),
  • If you have an ASA Cisco firewall

Then you should disable ESMTP inspection with the following commands in your firewall :

 ASA(config)# policy-map global_policy 
 ASA(config-pmap)# class inspection_default 
 ASA(config-pmap-c)# no inspect esmtp 
 ASA(config-pmap-c)# end 

Your firewall could also be slowing down your DNS server by inspecting and breaking EDNS packets, which results in having the DNS do double work. Find out

contact : @ychaouche yacinechaouche at yahoocom

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