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Full Discussion: Problem sending out emails
Operating Systems Linux Debian Problem sending out emails Post 303002236 by MadeInGermany on Sunday 20th of August 2017 02:53:46 PM
Old 08-20-2017
The receiving mail server sessmg12.x-company.net runs Symantec anti-virus/anti-spam and has blacklisted your mail relay server.
You must visit the given Symantec portal and ask for removal from the blacklist.
You mention a HP-UX server. HP-UX by default runs sendmail daemon that unfiltered listens to port 25 i.e. is open for spammers. It must not be reachable from the Internet! Additionally its listener should be restricted to localhost. Then it still can send mails from local users.
AFAIR the instruction for HP-UX:
in /etc/mail/sendmail.cf search for the line
Code:
O DaemonPortOptions=...

and add ,Addr=127.0.0.1 to the line.
To activate the new config run
Code:
/sbin/init.d/sendmail stop
/sbin/init.d/sendmail start


Last edited by MadeInGermany; 08-20-2017 at 04:34 PM.. Reason: how to restrict port 25
 

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SENDMAILCONFIG(8)					      System Manager's Manual						 SENDMAILCONFIG(8)

NAME
sendmailconfig - configure sendmail for Debian systems SYNOPSIS
sendmailconfig [--no-reload] DESCRIPTION
sendmailconfig is used to simplify the configuration of sendmail(8) for use on Debian systems. In the simplest case, you may run this program to (re)configure sendmail for your Debian system at any time. It will modify the file /etc/mail/sendmail.mc in order to create a working sendmail configuration which will be written to the file /etc/mail/sendmail.cf. For advanced configurations, you can modify the sendmail.mc file before generating sendmail.cf. Future invokations of sendmailconfig will preserve these changes provided they are made at the end of the file. Normally sendmailconfig will ask if you want to reload sendmail after making changes to its configuration. The --no-reload option will avoid this question. FILES
/etc/mail/sendmail.mc sendmail m4 input to generate sendmail.cf /etc/mail/sendmail.cf actual sendmail configuration file /etc/mail/sendmail.cw names for which we will accept mail in the standard configuration /etc/mail/sendmail.ct names of trusted users in the standard configuration SEE ALSO
sendmail(8) AUTHOR
Robert Leslie <rob@mars.org> 21-Jan-1997 SENDMAILCONFIG(8)
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