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Top Forums Shell Programming and Scripting Sendmail Fails to send emails from Linux server. Post 303003129 by drysdalk on Thursday 7th of September 2017 07:19:55 PM
Old 09-07-2017
Hi,

OK, I’m starting to run out of ideas off the top of my head, but we’re not totally done yet. One further possibility: does your system believe that it is in fact smtp.techx.com or techx.com? That’s one remaining possible explanation here.

So, some commands it might be useful to see the output of now include:

Code:
hostname 
grep -i techx /etc/hosts
grep hosts: /etc/nsswitch.conf
cat /etc/mail/service.switch

That last one might not exist, but it might - if it does, it would be interesting to see the contents, and it might well be our culprit.

Basically, at this point we’re now attempting to determine if your system believes it is in fact techx.com purely on the basis of hosts file entries, and also we want to see exactly how your system is configured to resolve hostnames when it encounters them.

Beyond that, I’m not sure what else to suggest. I’ve never known a smart relay entry to fail to work. Either something more fundamental is over-riding the behaviour of Sendmail, or it believes that it is in fact smtp.techx.com, and so is actually behaving correctly, so to speak.

EDIT: One last thing. What IP does your system resolve smtp.techx.com and techx.com to be, and are they in fact the same IP as your system ?
 

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Mail::SendEasy::SMTP(3pm)				User Contributed Perl Documentation				 Mail::SendEasy::SMTP(3pm)

NAME
Mail::SendEasy::SMTP - Handles the communication with the SMTP server without dependencies. DESCRIPTION
This module will handle the communication with the SMTP server. It hasn't dependencies and supports authentication. USAGE
use Mail::SendEasy ; $smtp = Mail::SendEasy::SMTP->new( 'domain.foo' , 25 , 120 ) ; if ( !$smtp->auth ) { warn($smtp->last_response_line) ;} if ( $smtp->MAIL("FROM:<$mail{from}>") !~ /^2/ ) { warn($smtp->last_response_line) ;} if ( $smtp->RCPT("TO:<$to>") !~ /^2/ ) { warn($smtp->last_response_line) ;} if ( $smtp->RCPT("TO:<$to>") !~ /^2/ ) { warn($smtp->last_response_line) ;} if ( $smtp->DATA =~ /^3/ ) { $smtp->print("To: foo@foo") ; $smtp->print("Subject: test") ; $smtp->print(" ") ; $smtp->print("This is a sample MSG!") ; if ( $smtp->DATAEND !~ /^2/ ) { warn($smtp->last_response_line) ;} } $smtp->close ; METHODS
new ($host , $port , $timeout , $user , $pass) Create the SMTP object and connects to the server. connect Connect to the server. auth_types The authentication types supported by the SMTP server. auth($user , $pass) Does the authentication. print (data) Send data to the socket connection. cmd (CMD , @MORE) Send a command to the server. response Returns the code response. If wantarray returns an ARRAY with the response lines. last_response Returns an ARRAY with the response lines. last_response_msg The last response text. last_response_line The last response line (code and text). close QUIT and close the connection. AUTHOR
Graciliano M. P. <gm@virtuasites.com.br> COPYRIGHT
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.4 2004-04-09 Mail::SendEasy::SMTP(3pm)
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