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Full Discussion: Sendmail Fails to send emails from Linux server.
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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LEARN ABOUT SUSE

calibre-smtp

CALIBRE-SMTP(1) 						      calibre							   CALIBRE-SMTP(1)

NAME

       calibre-smtp - part of calibre

SYNOPSIS

       calibre-smtp  [options] [from to text]

DESCRIPTION

       Send  mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are
       used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it.

       text is the body of the email message.  If text is not specified, a complete email message is read from STDIN.  from is the  email  address
       of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP
       negotiation, the message headers are not modified.

       Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks.

OPTIONS

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -l, --localhost
	      Host name of localhost. Used when connecting to SMTP server.

       -o, --outbox
	      Path to maildir folder to store failed email messages in.

       -f, --fork
	      Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures.

       -t, --timeout
	      Timeout for connection

       -v, --verbose
	      Be more verbose

   COMPOSE MAIL
       Options to compose an email. Ignored if text is not specified

       -a, --attachment
	      File to attach to the email

       -s, --subject
	      Subject of the email

   SMTP RELAY
       Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified.

       -r, --relay
	      An SMTP relay server to use to send mail.

       --port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise.

       -u, --username
	      Username for relay

       -p, --password
	      Password for relay

       -e, --encryption-method
	      Encryption method to use when connecting to relay. Choices are TLS and SSL. Default is TLS.

SEE ALSO

       The User Manual is available at http://calibre-ebook.com/user_manual

       Created by Kovid Goyal <kovid@kovidgoyal.net>

calibre-smtp (calibre 0.6.53)					     July 2010							   CALIBRE-SMTP(1)
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