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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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local.users(4)						     Kernel Interfaces Manual						    local.users(4)

NAME
local.users - Specifies mail recipients on the local host. DESCRIPTION
The local.users file contains a list of user names whose mail is to be delivered to the local host and whose return address is user- name@hostname. Entries in the local.hosts file are in addition to other local users (such as root and postmaster). See sendmail.cf(4) for a description of other local users. You can add entries to this file if the host is configured as a simple client and either of the following is true: The user wants their mail delivered on this machine rather than being forwarded to the mail server. You are adding aliases to the /var/adm/sendmail/aliases file. When the host is configured as a simple client, the alias must be added to this file and the aliases file. A simple client is defined as a host that had the mail system configured using the MailConfig application from the System Management utili- ties or configured using the mailsetup utility's Quick Setup menu. The format of the file is as follows: User names are separated by blanks or new lines. Multiple user name can be specified on a line. Blank lines are ignored. A comment mark (#) ends the line. After modifying the local.users file, you must restart the sendmail daemon to apply the changes. Use the following command: # /sbin/init.d/sendmail restart EXAMPLES
root postmaster rw # A comment followed by an ignored blank line. # Another comment. mariah # Another comment. carey # Leading blanks are acceptable. FILES
Specifies the path name for the file. RELATED INFORMATION
Files: sendmail.cf(4). delim off local.users(4)
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