That message looks something like this:
HELO here.us.edu
* Note that this works only if the remote filesystem is mounted with the intr mount option.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
24.9 Alphabetized Options | 1103
The other site then replies with acknowledgment of the local HELO or EHLO:
250 there.dc.gov Hello here.us.edu, pleased to meet you
The amount of time the local sendmail waits for the other site to acknowledge the local
HELO or EHLO is set with the helo keyword, the forms of which are as follows:
O Timeout.helo=timeout ?†? configuration file (V8.6 and later)
-OTimeout.helo=timeout ?†? command line (V8.6 and later)
define(`confTO_HELO??, `timeout??) ?†? mc configuration (V8.6 and later)
The default value is five minutes. There is no specified minimum, but we recommend no
less than five minutes (because some sites use DNS to validate the hostname). The mc technique
uses confTO_HELO, which has no default.
24.9.119.11 Timeout.hoststatus (V8.8 and later)
When processing the queue, sendmail saves the connection status of each host to which it
connects and each host to which it fails to connect. It does this because an unsuccessful
host should not be tried again during the same queue run. This makes sense when you
consider that failures tend to remain failures for a while.
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