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Sending Messages -- Routing and Transport
View the book table of contents
Author: Tony Redmond
Published: October 2000
Copyright: 2001
Publisher: Digital Press
 


TABLE 2: IMPORTANT SETTINGS FOR SMTP VIRTUAL SERVER
SMTP Server Property  Default valueOther possible values
Outbound securityAllow anonymous connections. Exchange 2000 servers ignore this setting as they establish their own credentials before sending messages.Require basic authentication (clear text) or TLS (encrypted) with a X.509 server certificate.
Inbound securityAllow anonymous connections (must be set to allow IMAP and POP clients to send messages) Require basic authentication or TLS
Port number25Any free IP port
Limit message size2048 KB (2MB) 
Limit number of messages per connectionUnlimited 
Limit number of recipients per messageUnlimited 
Outbound retry intervals1st 15 minutes, 2nd 30 minutes, 3rd 60 minutes, then 240 minutes until timeout 
Delay notificationsSend after 12 hours 
Expiration timeout2 days 
Local delivery delay12 hours 
Maximum hop count15 
Smart host nameFQDN or IP address of smart host server 
Connection controlsAll servers can connectDefine a list of servers that are allowed to connect to this server
Relay restrictionsAll servers that can connect can relay (submit messages for onward delivery)Define a list of servers that are allowed to relay messages.



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