The DoubleBounceAddress option specifies the recipient (Web hosting asp) of error
The DoubleBounceAddress option specifies the recipient of error messages that result from a failure to deliver an earlier error message. The default value is the postmaster alias. The DeadLetterDrop option sets the backup location for saving bounced e-mail if the bounced e-mail can’t be written to other locations (by default, it is /var/tmp/dead.letter). The next lines relate to the user ID used for sendmail processing: # what user id do we assume for the majority of the processing? #O RunAsUser=sendmail By using the RunAsUser option, sendmail can be configured to perform most of its processing (other than reading the configuration file and listening for incoming connections on a privileged port) as an unprivileged user. The RunAsUser option specifies the user name or UID of the user. This may sound like a good idea, but it has the side effect of requiring the unprivileged user to have access to all .forward files, :include: files, and the queue directory. This will likely require liberal use of the DontBlameSendmail options and could cause more problems than it solves. The next lines relate to the recipients in an SMTP envelope: # maximum number of recipients per SMTP envelope #O MaxRecipientsPerMessage=100 The MaxRecipientsPerMessage option specifies the upper boundary on the number of individual recipients per message in an effort to block mail spam (unsolicited commercial e-mail or unsolicited bulk e-mail), which is commonly sent to large distribution lists. By default, there is no restriction. The next lines relate to getting local names: # shall we get local names from our installed interfaces? O DontProbeInterfaces=true The DontProbeInterfaces option (if set to True) keeps sendmail from automatically modifying the class macro Cw with the hostnames and addresses of all physical network interfaces. By default, the equivalent hosts and addresses are added to Cw. The next lines relate to delivery status notification (DSN): # Return-Receipt-To: header implies DSN request #O RrtImpliesDsn=False The RtrImpliesDsn option causes a delivery status notification to be sent to the envelope sender instead of to the address contained in the header. The next option lets you override the connection address. # override connection address (for testing) #O ConnectOnlyTo=0.0.0.0 To force delivery of mail to all go to a particular address, you can add an IP address using the ConnectOnlyTo option. This is useful for testing purposes. The next option relates to defining a trusted user: # Trusted user for file ownership and starting the daemon #O TrustedUser=root The TrustedUser option can be used to set which user on your system is trusted to own sendmail-related files and to run sendmail daemons. The user name can be either the name or user ID contained in the /etc/passwd file. The next set of options can be used to indicate the locations of certificate authority (CA) certificates and private keys on your system: # CA directory #O CACERTPath # CA file #O CACERTFile # Server Cert #O ServerCertFile # Server private key #O ServerKeyFile
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