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firewallesmtp [2019/05/07 12:51] (current)
yassine chaouche created
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 +[[index|Home]] > [[Computers|Computers]] > [[mail]] > [[firewallesmtp|firewallsmtp]] | [[About]]
  
 +  * 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. [[firewallEDNS|Find out]]
 +
 +
 +----
 +
 +contact : [[http://​twitter.com/​ychaouche|@ychaouche]] yacinechaouche at yahoocom

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