nixCraft

kasimani · #1 (**permalink**) 10-25-2006, 09:43 PM

1.)
I have a query about Sendmail that why we need DNS for Sendmail, whereas it can also run with default configuration with No DNS

2.)
Is sendmail can be configured as Mail Router as well as Mail Server for Local Users. If Yes. Pl. give me logic behind it, that how it will deferentiate between internet mail account (Global account

and Local Users mail account.

3.)
Can we see the log report of Internet Uses Using Squid Proxy.

nixcraft · #2 (**permalink**) 10-25-2006, 11:48 PM

Quote:

1.)
I have a query about Sendmail that why we need DNS for Sendmail, whereas it can also run with default configuration with No DNS

No you can't use sendmail or any other modern MTA without DNS. You need DNS to find out mail server name for each domain. For example following query shows the mail serer for this site (cyberciti.biz)

Code:

host -t mx cyberciti.biz

cyberciti.biz mail is handled by 10 mail.cyberciti.biz.

Code:

host -t mx nixcraft.com

nixcraft.com mail is handled by 10 ASPMX.L.GOOGLE.com.

So when someone sends an email to me@nixcraft.com or me@cyberciti.biz it is handled by ASPMX.L.GOOGLE.com. or mail.cyberciti.biz mail server respectively. DNS is used to provide this information.

Quote:

2.)Is sendmail can be configured as Mail Router as well as Mail Server for Local Users. If Yes. Pl. give me logic behind it, that how it will deferentiate between internet mail account (Global account

and Local Users mail account.

Is sendmail can be configured as Mail Router as well as Mail Server for Local Users. If Yes. Pl. give me logic behind it, that how it will deferentiate between internet mail account (Global account

and Local Users mail account.
If you local UNIX/Linux username it will be send to local mail account for example

Code:

mail -s "test" vivek < /dev/null

But if you use @domain it will be queried using DNS and mail is send to actual mail server:

Code:

mail -s "test" vivek@nixcraft.in < /dev/null

Quote:

Can we see the log report of Internet Uses Using Squid Proxy.

Can we see the log report of Internet Uses Using Squid Proxy.
Yes use /var/log/squid/access.log and /var/log/squid/cache.log files.

Code:

tail -f /var/log/squid/access.log
tail -f /var/log/squid/cache.log

kasimani · #3 (**permalink**) 10-26-2006, 12:38 AM

I want the working funda behind sendmail

1) On what basis it will differentiates local mail accounts with Internet mail account

i have a network in which linux box acting as Mail server for local users, now i want to set up this box also to Mail Router from Internet.

Clients are using MS Outlook for mail sending and retrival.
pl. give the experimental things

Thanks