mailhandlers like mh (used in emacs for instance), and exmh, use sendmail. In the default configuration of sendmail, /etc/sendmail.cf should read the database corresponding to /etc/mail/access and allow relaying of mail from localhost. /etc/sendmail.cf is not properly configured, so that the entries in /etc/mail/access are ignored and it is impossible to send mail using the above mailhandlers. P.S. reverting to RedHat 5.2's /etc/sendmail.cf and regenerating ip_allow, name_allow, relay_allow in /etc/mail is a workaround, but it is perhaps not as secure.
*** Bug 2678 has been marked as a duplicate of this bug. *** mailhandlers like mh (used in emacs for instance), and exmh, use sendmail. In the default configuration of sendmail, /etc/sendmail.cf should read the database corresponding to /etc/mail/access and allow relaying of mail from localhost. /etc/sendmail.cf is not properly configured, so that the entries in /etc/mail/access are ignored and it is impossible to send mail using the above mailhandlers. P.S. reverting to RedHat 5.2's /etc/sendmail.cf and regenerating ip_allow, name_allow, relay_allow in /etc/mail is a workaround, but it is perhaps not as secure. P.P.S. I note that bug 2400 reports the same symptoms. The working sendmail.cf is from the rpm 8.8.7-20, the sendmail rpm in the redhat 6.0 distribution is 8.9.3-10.
This issue has been forwarded to a developer for further review.
This should have been fixed in the shipping Red Hat Linux 6.0. Please reopen if that is not the case.