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After my CentOS 6.4 install, sendmail-related components were set up as follows:

mail:x:12:mail,postfix in /etc/group

drwx------ 2 root mail 4096 Sep 6 14:06 /var/spool/mqueue

And I was getting these errors when invoking a shell script to send email with an attachment, but not a plain mail -s "subject" recipient < /dev/null on the command line

Sep  6 12:46:08 localhost sendmail[3554]: NOQUEUE: SYSERR(ics): can not chdir(/var/spool/mqueue/): Permission denied

This is what I did to fix the problem, but why did I have to do it, and what else could I have done? Those are my questions.

mail:x:12:mail,postfix,smmsp in /etc/group

drwxrwx--- 2 root smmsp 4096 Sep 6 14:06 /var/spool/mqueue


To make matters stranger, a CentOS 5.9 system set up just the way my system was set up works fine without the error.

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see serverfault.com/questions/520531/… – cas Sep 14 '13 at 0:15
Are you chrooted after installation? – PersianGulf Sep 14 '13 at 5:28
@MohsenPahlevanzadeh I'm not sure what your comment means. On every other system I have, I installed, made sure sendmail was running and mail client was installed, and then any user can send mail off the box. It works now, but not until I tweaked the things indicated in the OP. – octopusgrabbus Sep 14 '13 at 13:48
@CraigSanders That's the answer. If you put in something to that affect, I'll accept it. – octopusgrabbus Sep 14 '13 at 13:50
ok, done. btw, i'm not sure why you've tagged this 'postfix' because it's a question about sendmail, not postfix. – cas Sep 15 '13 at 0:05
up vote 4 down vote accepted

The sendmail binary should be in group smmsp and setgid and /var/spool/mqueue should be group smmsp, and group writable.

chgrp smmsp /usr/sbin/sendmail.sendmail
chmod a=rx,g+s /usr/sbin/sendmail.sendmail

chgrp smmsp /var/spool/mqueue
chmod ug=rwx,o= /var/spool/mqueue

see http://serverfault.com/questions/520531/sendmail-chdir-clientmqueue-permission-denied

As for the reason why - most likely a packaging bug. Report it to the Centos developers so they can fix it. http://bugs.centos.org

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