The qmail Handbook
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H
Haar, Jason, and Qmail-Scanner, 404–414, 437
Hampton, Catherine A., and SpamBouncer, 293
hard delivery errors, 140
Hardie, Chris, and anti-spam, 285
hardware. See system hardware
harnesses, defined, 404
Hazel, Philip, and Exim, 11
header fields. See message headers, using to troubleshoot
headers vs. envelopes, 444–446
helohost control file, 101
help function in qmailctl, 165
history of qmail, 1, 15
host-based relaying, 112–113
host (domain) setting in messages, 128–129
host names. See multiple host names
hup function in qmailctl, 163
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