A good recommended value is 4.
In addition to these gross adjustments, you can also differentiate between a first DNS
lookup and subsequent DNS lookups. The first time a message is tried for delivery, you
might want to set the retransmission and retry limits very low to screen out hard-to-deliver
sites. Then for all the following (normal) tries, you can set those limits high so that all
subsequent tries will likely succeed. You differentiate between the two by appending either
a .first or a .normal suffix to retrans or retry:
O Timeout.resolver.retrans.first=timeout ?†? configuration file (V8.10 and later)
O Timeout.resolver.retrans.normal=timeout ?†? configuration file (V8.10 and later)
O Timeout.resolver.retry.first=num ?†? configuration file (V8.10 and later)
O Timeout.resolver.retry.normal=num ?†? configuration file (V8.10 and later)
-OTimeout.resolver.retrans.first=timeout ?†? command line (V8.10 and later)
-OTimeout.resolver.retrans.normal=timeout ?†? command line (V8.10 and later)
-OTimeout.resolver.retry.first=num ?†? command line (V8.10 and later)
-OTimeout.resolver.retry.normal=num ?†? command line (V8.10 and later)
define(`confTO_RESOLVER_RETRANS_FIRST??, `timeout??) ?†? mc configuration (V8.10 and later)
define(`confTO_RESOLVER_RETRANS_NORMAL??, `timeout??) ?†? mc configuration (V8.10 and later)
define(`confTO_RESOLVER_RETRY_FIRST??, `num??) ?†? mc configuration (V8.
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