Sendmail alias to null mailbox

A Run Extended smtp (esmtp) protocol (defined in RFCs 1869, 1652, and 1870).
This prevents mail from getting stuck on the null client if it is turned off while some remote destination is unreachable.
Although there are pathological cases where it can be slower than multiple rcpt, the simplicity and verp advantages outweigh that overall.If no lookup is found, the indicated default is inserted; if no default is specified and no lookup matches, the value is left unchanged.However, it should be useful on firewalls and other places where users don't have accounts and the aliases file is well constrained.E.g., when a message comes in addressed to dave-list-qmail, it'll use the first one of the following that it finds:.qmail-list-qmail.qmail-list-default.qmail-default If no matching.qmail file is found, the delivery fails and the message bounces back to the sender.It looks something like: To: [email protected] Subject: lunch How about pizza?Reliability, once qmail accepts a message, it guarantees that it won't be lost.This saves the server from a lot of unnecessary work, but has a negative side effect, too.This allows a bounce handler to identify the problem subscriber. /var/qmail/bin/qmail-smtpd 2 1 rblsmtpd was previously available as a separate utility, but is now bundled with ucspi-tcp.
If present, this is the name of a host to override the local host.
The mailer must be a single word, but the host and user may be multi-part.
Solaris and pre-4.4BSD kernel users should see the note in sendmail/readme.To see these messages, use ps or some other process listing command.The mapclass is the name of a type of map; these are compiled in to sendmail.Local names that are not aliases are passed through a new distinguished ruleset five; this can be used to append a local relay.PersistentMacros set to the macros would should be saved across queue runs.NoRecipientAction no short name The action to take when you receive a message that has no valid recipient headers (To Cc Bcc or Apparently-To: - the last included for back compatibility with old sendmail s).Qmail John Levine has written a qmail book for O'Reilly Associates ( m/ ).Classes defined in config files may be given names from the set of upper case letters for short names or beginning with an upper case letter for long names.The lookup returns the result of the computation,.e.Conf-split must be a prime number.If ServiceSwitchFile is not specified, it defaults to /etc/mail/service.Check addresses to see if they begin with a if they do, convert them to the prog mailer.In addition to the base address, username @ hostname.Added recipient validation section to Advanced Topics.The final value of ruleset n then becomes the substitution for this rule.

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