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Similar problems can occur If it's a selinux issue, which would be fixed by:<br />
<br />
semanage boolean &nbsp;-l|grep sendmail<br />
&nbsp; &nbsp; httpd_can_sendmail &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -&gt; off &nbsp; Allow http daemon to send mail<br />
setsebool -P httpd_can_sendmail on
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I am able to send the mail from root user by issuing the command.<br />
&nbsp;mail -s &quot;hello&quot; abc@gmail.com<br />
<br />
But not able to send emails through this command from other users.<br />
like apache or other user accounts getting the error.<br />
for apache<br />
&nbsp;sendmail[3690]: NOQUEUE: SYSERR(apache): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied<br />
&nbsp;for other users<br />
&nbsp;sendmail[3690]: NOQUEUE: SYSERR(admin): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied<br />
<br />
<br />
&nbsp;
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I am able to send the mail from root user by issuing the command.
 mail -s "hello" abc@gmail.com

But not able to send emails through this command from other users.
like apache or other user accounts getting the error.
for apache
 sendmail[3690]: NOQUEUE: SYSERR(apache): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied
 for other users
 sendmail[3690]: NOQUEUE: SYSERR(admin): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied


 

Similar problems can occur If it&#39;s a selinux issue, which would be fixed by:

semanage boolean  -l|grep sendmail
    httpd_can_sendmail             -&gt; off   Allow http daemon to send mail
setsebool -P httpd_can_sendmail on

Sendmail error

I am able to send the mail from root user by issuing the command.
 mail -s &quot;hello&quot; abc@gmail.com

But not able to send emails through this command from other users.
like apache or other user accounts getting the error.
for apache
 sendmail[3690]: NOQUEUE: SYSERR(apache): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied
 for other users
 sendmail[3690]: NOQUEUE: SYSERR(admin): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied


 

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.