If you use
the mc configuration, the default for confALIAS_WAIT is 10 minutes.
The AliasWait option is not safe. If specified from the command line, it can cause sendmail
to relinquish its special privileges.
24.9.3 AllowBogusHELO
Allow HELO or EHLO sans host V8.8 and later
Prior to V8.7, sendmail would accept without complaint an SMTP HELO command (or an
EHLO) that omitted the hostname:
220-oldsite.uofa.edu Sendmail 8.6.13/8.6.13 ready at Fri, 13 Dec 2002 08:11:44 -0700
220 ESMTP spoken here
HELO
250 oldsite.uofa.edu Hello here.ufa.edu [123.45.67.89], pleased to meet you
RFC1123, Section 5.2.5 specifies that all HELO and EHLO commands must be followed
by a fully qualified hostname:
HELO here.uofa.edu
EHLO here.uofa.edu
Beginning with V8.7, omitting the hostname results in one of the following errors:*
501 5.0.0 HELO requires domain address
501 5.0.0 EHLO requires domain address
Note that there is no check to see that the hostname is actually that of the connecting host
unless PICKY_HELO_CHECK is declared when sendmail is compiled (?§3.4.42 on page
133). Also note that the specified hostname must appear to be a correctly formed hostname.
If it is not, the following is printed:
501 5.0.0 Invalid domain name
If you favor forcing other sites to obey the RFCs, don??™t enable this option. But note that
you might need to enable it if your site accepts connections from other sites that don??™t obey
the protocols.
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