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Bug 10753 - Denial of receiving mails with empty MAIL FROM: (e.g. error msgs from MAILER-DAEMONs)
Denial of receiving mails with empty MAIL FROM: (e.g. error msgs from MAILER-...
Product: Red Hat Linux
Classification: Retired
Component: sendmail (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Cristian Gafton
Depends On:
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Reported: 2000-04-12 10:55 EDT by William D. Hamblen
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2000-05-19 06:32:53 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description William D. Hamblen 2000-04-12 10:55:57 EDT
sendmail 8.9.3-15 (from RH 6.1, also -30 from 6.2) refuses to receive
incoming mails via SMTP when there is an empty MAIL FROM: during the SMTP
session producing the following output in /var/log/maillog:

Apr 12 16:53:17 sirion sendmail[21407]: QAA21407: SYSERR(root): buildaddr:
no host
Apr 12 16:53:17 sirion sendmail[21407]: QAA21407: from=<NONE>, size=0,
class=0, pri=0, nrcpts=0, proto=SMTP, relay=some_host [some_ip]

This usually happens when someone of our users tried to send mail to an
invalid email address. The remote MTA generates an error message which is
sent back to the sender of the original message but with an empty MAIL

This error can be reproduced on several machines.

I used /sbin/mailconf to generate /etc/sendmail.cf. Using the vanilla
sendmail.cf directly from the RPM without calling mailconf, the error does
*NOT* occur, i.e. sendmail will accept SMTP connections with empty MAIL
Comment 1 Florian La Roche 2000-05-19 06:32:59 EDT
this bug is fixed with newer sendmail versions and only linuxconf must
be updated to use newer sendmail configurations

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