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Top Forums Shell Programming and Scripting Sendmail Fails to send emails from Linux server. Post 303003026 by mohtashims on Wednesday 6th of September 2017 05:18:22 PM
Old 09-06-2017
RedHat

Quote:
Originally Posted by Corona688
You could try to connect to port 25 in telnet. If you can connect from a different machine, it's obviously not firewalled. If you can't connect even from the same machine, port 25 isn't being listened for.
I m able to telnet successfully to port 25,587 & 465 from a remote system.

Code:
[root@techx ~]telnet 45.77.141.129 25
Trying 45.77.141.129...
Connected to 45.77.141.129.
Escape character is '^]'.
220 techx.com ESMTP Sendmail 8.14.7/8.14.7; Wed, 6 Sep 2017 21:09:19 GMT

telnet 45.77.141.1229 587
Trying 45.77.141.129...
Connected to 45.77.141.129.
Escape character is '^]'.
220 Development_Digiklug ESMTP Sendmail 8.14.7/8.14.7; Wed, 6 Sep 2017 21:20:18 GMT


telnet 45.77.141.129 465
Trying 45.77.141.129...
Connected to 45.77.141.129.
Escape character is '^]'.
454 4.3.3 TLS not available: error generating SSL handle
Connection closed by foreign host.

Also, locally all the ports seems to be listening as shown below.

Code:
[root@development_techx ~]# netstat -ntlp | grep sendmail
tcp        0      0 0.0.0.0:587             0.0.0.0:*               LISTEN      1954/sendmail: acce
tcp        0      0 0.0.0.0:465             0.0.0.0:*               LISTEN      1954/sendmail: acce
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      1954/sendmail: acce

So, i don't think there is any issue with the firewall.

Can you please tell me what could be the issue with the sending of emails?

Last edited by mohtashims; 09-07-2017 at 04:10 AM..
 

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mconnect(1)							   User Commands						       mconnect(1)

NAME
mconnect - connect to SMTP mail server socket SYNOPSIS
mconnect [-p port] [-r] [hostname] DESCRIPTION
The mconnect utility opens a connection to the mail server on a given host, so that it can be tested independently of all other mail soft- ware. If no host is given, the connection is made to the local host. Servers expect to speak the Simple Mail Transfer Protocol (SMTP) on this connection. Exit by typing the quit command. Typing EOF sends an end of file to the server. An interrupt closes the connection immedi- ately and exits. OPTIONS
The following options are supported: -pport Specify the port number instead of the default SMTP port (number 25) as the next argument. -r Raw mode: disable the default line buffering and input handling. This produces an effect similar to telnet(1) to port number 25. OPERANDS
The following operand is supported: hostname The name of a given host. USAGE
The mconnect command is IPv6-enabled. See ip6(7P). FILES
/etc/mail/sendmail.hf Help file for SMTP commands ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsndmu | +-----------------------------+-----------------------------+ SEE ALSO
telnet(1), sendmail(1M), attributes(5), ip6(7P) Postel, Jonathan B., RFC 821, Simple Mail Transfer Protocol, Information Sciences Institute, University of Southern California, August 1982. SunOS 5.11 28 Jan 2008 mconnect(1)
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