Sendmail Pauses for Up to a Minute at Each Command

Make sure that Sendmail can resolve your hostname to a valid (i.e.,
parsable) domain address. If you are not connected to the Internet, or
have a dial-up connection with dynamic IP addressing, add the fully
qualified domain name to the /etc/hosts file, in addition to the base
host name; e.g., if the host name is "bilbo" and the domain is
"" bilbo

And make sure that either the /etc/host.conf or /etc/resolv.conf file
contains the line:

order hosts,bind

Caution: Do not change the "localhost" entry in /etc/hosts, because
many programs depend on it for internal message-passing.

Sendmail takes many factors into account when resolving domain
addresses. These factors, collectively, are known as, "rulesets," in
sendmail jargon. The program does not require that a domain address be
canonical, or even appear to be canonical. In the example above,
"bilbo." (note the period) would work just as well as
"" This and other modifications apply mainly to
recent versions.

Prior to version 8.7, sendmail required that the FQDN appear first in
the /etc/hosts entry. This is due to changes in the envelope address
masquerade options. Consult the sendmail documents.

If you have a domain name server for only a local subnet, make sure
that "." refers to a SOA record on the server machine, and that
reverse lookups (check by using nslookup) work for all machines on the

Finally, FEATURE configuration macro options like nodns,
always_add_domain, and nocanonify, control how sendmail interprets
host names.

The document, Sendmail: Installation and Operation Guide, included in
the doc/ subdirectory of Sendmail source code distributions, discusses
briefly how Sendmail resolves Internet addresses. Sendmail source code
archives are listed at:

[Chris Karakas]
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