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Read and understand the
maildrop queue,
incoming queue,
and
active queue discussions in the
QSHAPE_README document.
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Run a local name server to reduce slow-down due to DNS
lookups. If you run multiple Postfix systems, point each local name
server to a shared forwarding server to reduce the number of lookups
across the upstream network link.
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Eliminate unnecessary LDAP lookups, by specifying a domain
filter. This eliminates lookups for addresses in remote domains,
and eliminates lookups of partial addresses. See
ldap_table(5) for
details.
When Postfix responds slowly to SMTP clients:
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Look for obvious signs
of trouble as described in the DEBUG_README document, and
eliminate those problems first.
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Turn off your
header_checks and
body_checks patterns and
see if the problem goes away.
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Turn off chroot
operation as described in the DEBUG_README document and see
if the problem goes away.
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If Postfix logs the SMTP client as "unknown" then you have
a name service problem: the name server is bad, or the resolv.conf
file contains bad information, or some packet filter is blocking
the DNS requests or replies.
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If the number of
smtpd(8) processes has reached the process
limit as specified in master.cf, new SMTP clients must wait until
a process becomes available. Increase the number of processes if
memory permits. See the instructions given under "Tuning the number of Postfix processes".
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