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Server

postfix/sendmail can't read main.cf file

Alessandro Iaselli

12/8/22, 1:46 PM

I'm trying to configure a mailserver, but when i run:

echo "test email" | mail -s "test" [email protected] -aFrom [email protected]

and check tail /var/log/mail.err I get Aug 8 13:36:37 localhost postfix/sendmail[7034]: fatal: open /etc/postfix/main.cf: Permission denied.

Here are /etc/postfix folder permissions:

root@localhost:~# ls -la /etc/postfix/
total 156
drwxr-x---   5 root vmail  4096 Aug  8 13:09 .
drwxr-xr-x 112 root root   4096 Aug  8 13:33 ..
-rwxr-xr-x   1 root vmail   100 Aug  8 11:38 dynamicmaps.cf
drwxr-xr-x   2 root vmail  4096 Jun 19  2020 dynamicmaps.cf.d
-rwxr-xr-x   1 root vmail  3126 Aug  8 13:09 main.cf
-rwxr-xr-x   1 root vmail  1390 Aug  7 15:58 main.cf.orig
-rwxr-xr-x   1 root vmail 27120 Aug  7 15:24 main.cf.proto
lrwxrwxrwx   1 root root     31 Aug  7 15:25 makedefs.out -> /usr/share/postfix/makedefs.out
-rwxr-xr-x   1 root vmail  6511 Aug  8 12:27 master.cf
-rwxr-xr-x   1 root vmail  6208 Aug  7 16:17 master.cf.orig
-rwxr-xr-x   1 root vmail  6208 Aug  7 15:24 master.cf.proto
-rwxr-xr-x   1 root vmail   148 Aug  7 16:13 mysql-virtual-alias-maps.cf
-rwxr-xr-x   1 root vmail   139 Aug  7 16:12 mysql-virtual-email2email.cf
-rwxr-xr-x   1 root vmail   137 Aug  7 23:53 mysql-virtual-mailbox-domains.cf
-rwxr-xr-x   1 root vmail   135 Aug  7 16:13 mysql-virtual-mailbox-maps.cf
-rwxr-xr-x   1 root vmail 10268 Jun 19  2020 postfix-files
drwxr-xr-x   2 root vmail  4096 Aug  8 11:38 postfix-files.d
-rwxr-xr-x   1 root vmail 11532 Jun 19  2020 postfix-script
-rwxr-xr-x   1 root vmail 29872 Jun 19  2020 post-install
drwxr-xr-x   2 root vmail  4096 Jun 19  2020 sasl

I am sorry if my question is badly formatted but i am new here. I will update if it helps you.

409

0 + 7

ubuntu

postfix

Gerald Schneider

12/8/22, 2:13 PM

What user is postfix using? Is it a member of the vmail group?

Paul

12/8/22, 3:03 PM

Directories and files in `/etc/postfix/` are usually user and group `root`, with specific exceptions such as DKIM keys, with configuration files having `0644` permissions (and private keys `0640`). I'm not an expert at all configurations, I'm just not clear why `vmail` group would need to be assigned to those files.

Paul

12/8/22, 4:24 PM

@GeraldSchneider In Ubuntu `postfix` installed from repos runs `chroot` in `/var/spool/postfix/`, if I understand those configurations correctly.

Romeo Ninov

12/9/22, 12:54 PM

Do you have SELinux activated?

Michael Hampton

12/10/22, 9:15 PM

@RomeoNinov The post already shows SELinux is disabled.

Alien Life Form

12/12/22, 9:40 AM

I'd try chmod 755 /etc/postfix, for a start.

Paul

12/12/22, 1:20 PM

I think this user has left us, and I just noticed that SE no longer publishes the user last visit, so who knows if this user will ever return. I'm wondering if these permissions are the result of one of those pesky admin panel things?

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: postfix/sendmail can't read main.cf file

TH: postfix/sendmail ไม่สามารถอ่านไฟล์ main.cf ได้

RO: postfix/sendmail nu poate citi fișierul main.cf

RU: postfix/sendmail не может прочитать файл main.cf

VI: postfix/sendmail không thể đọc tệp main.cf

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