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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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