RedHat ES 3.0 send mail does sendmail need to be on

Does sendmail need to be on to send mail?

LHradowy wrote:
> Does sendmail need to be on to send mail?

Most mail clients don't have a built in SMTP, so you need to configure the
mailcleinet to use one and it don't have to be a local one.

On Thu, 01 Apr 2004 12:41:05 -0600, LHradowy wrote:

> Does sendmail need to be on to send mail?

No.

If your ISP gives you server names such as smtp.your-isp.com for outgoing
and pop.your-isp.com for incoming, just use those addresses in your mail
client and they will go via your ISP.

Regards,
Dave

On Thu, 01 Apr 2004 12:41:05 -0600 LHradowy wrote:

> Does sendmail need to be on to send mail?

If you do not run the sendmail service you will get no mails generated by
the system, like from logwatch or by cron generated information mail. I
fell on a server it is highly wanted to get mail feedback from the system
for the root user.

By default sendmail is limited to localhost on RHEL, so no outside users
are able to access the service.

Alexander


--
Alexander Dalloz | Enger, Germany
PGP key valid: made 13.07.1999
PGP fingerprint: 2307 88FD 2D41 038E 7416 14CD E197 6E88 ED69 5653

On Fri, 02 Apr 2004 01:49:43 +0200, Alexander Dalloz
<(E-Mail Removed)> wrote:

> On Thu, 01 Apr 2004 12:41:05 -0600 LHradowy wrote:
>
>> Does sendmail need to be on to send mail?

No. It might need to be installed on the machine, depending on your
mail program, but it doesn't need to be running.


> If you do not run the sendmail service you will get no mails generated by
> the system, like from logwatch or by cron generated information mail.

For this sendmail only needs to be installed on the machine. It does
not need to be running as a daemon for system mail to be delivered.

The only problem would be if such system mail was being sent to another
machine, in which case it might be temporarily undeliverable. To handle
that you would want to run "sendmail -q" from a cron job once in a
while.


--
-| Bob Hauck
-| To Whom You Are Speaking
-| http://www.haucks.org/

LHradowy wrote:

> Does sendmail need to be on to send mail?

No, sendmail does not need to run. However, if mail could not be
delivered immediately, it would be stored in the queue. If you don't
have sendmail running (at least in queue runner mode), mail that
couldn't be delivered immediately would stay in mail queue forever.

Also, starting with some version of sendmal package, some of the locally
generated mails will first go to the client mailqueue. If you don't
have queue runner for client mailqueue running, mail stays in client
mailqueue forever.

Aleksandar Milivojevic wrote:

> Also, starting with some version of sendmal package, some of the locally
> generated mails will first go to the client mailqueue. If you don't
> have queue runner for client mailqueue running, mail stays in client
> mailqueue forever.

Forgot to mention, for client mailqueue to empty (if you have it), you
either need two sendmail processes, client mailqueue runner, and main
sendmail listening on localhost. Or client mailqueue runner with
submit.cf changed to point to smart host instead of localhost.