topic Re: Sendmail in Operating System - Linux

Sendmail

Choppa Kumar — Mon, 23 Aug 2004 11:21:19 GMT

Ddear All ,
Could you some one help me how to restrict the sending the SMTP mails through sendmail using the /etc/aliases database.i'll be apprecite for your prompt reponse
Regards,
kumar umar

Re: Sendmail

G. Vrijhoeven — Mon, 23 Aug 2004 13:13:46 GMT

Hi kumar umar,

You can check this link:
http://www.unet.univie.ac.at/aix/files/aixfiles/aliases.htm

More info on sendmail configs:
http://www.uwsg.iu.edu/usail/mail/op/op.html

HTH,

Gideon

Re: Sendmail

Stuart Browne — Mon, 23 Aug 2004 18:24:12 GMT

Restricting is usually the job of '/etc/mail/access', not '/etc/aliases'.

What sort of things are you wanting to restrict? the source of the message? The destination? The user sending?

Re: Sendmail

Choppa Kumar — Tue, 24 Aug 2004 03:02:05 GMT

Hi,
Nice to see your reply .I want keep restriction on user sending SMTP mails .Please sugest .
Kumar

Re: Sendmail

Chris Saunderson — Tue, 24 Aug 2004 09:36:29 GMT

Are you referring to SMTP AUTH? Or POP-before-SMTP. This may be what you are looking for:

http://popbsmtp.sourceforge.net/

Re: Sendmail

Choppa Kumar — Tue, 24 Aug 2004 10:33:44 GMT

pl find the setup details.we have E2K with sendmail as SMTP gateway .Every one can able to send smtp mails but con't receive.only specifed users having entries in "/etc/aliases " file can get SMTP files.Pl advice

Re: Sendmail

Stuart Browne — Tue, 24 Aug 2004 22:46:16 GMT

Sorry about the previous post.. wrong thread ;)

From the description, you only want certain 'users' to be able to relay?

Two options, one easier than the other.

If a given 'user' is always at a given terminal (PC), then using '/etc/mail/access' and allowing certain IP's to 'relay' (instead of the entire subnet) will

give you this.

If the users roam around, then you need to set up 'SMTP Auth', and have those users authenticate against the SMTP server first, before being able to

send/relay messages out.

The sendmail FAQ has details on setting SMTP Auth up.

Re: Sendmail

Choppa Kumar — Thu, 26 Aug 2004 15:26:03 GMT

Can you pl provide me in detail

Re: Sendmail

SELVAM_1 — Fri, 27 Aug 2004 01:56:34 GMT

An access database can be created to accept or reject mails from selected domains or senders. You edit a text file /etc/mail/access. Each domain/computers/senders can be followed by :OK,RELAY,REJECT or DISCARD.

#####-----------------------
# SAMPLE OF /etc/mail/access
#####-----------------------
localhost.localdomain RELAY
localhost RELAY
127.0.0.1 RELAY
spammer@aol.com REJECT
192.168.1 RELAY

==============================
After modifying access text file, you have to create database map with command: makemap hash /etc/mail/access.db < /etc/mail/access

or chk

http://www.faqs.org/docs/securing/chap22sec178.html

for full details.

Hope this will help