I have a problem with my sendmail service... it doesnt send mails.. What could be the problem?
Thanks

The configuration.

http://www.catb.org/~esr/faqs/smart-questions.html

I allready know that... I've read the man... the problem it that something is sliping. What could that be ?...
PS: it's not the hostname
Tanks!

His point was you have given us next to nothing to go on.

1. Is sendmail even running?
2. Do you have a firewall in place?
3. Does it send mail locally but not outside your network (or the box itself)?
4. Which version of Redhat are you using, if you are using the Distro in your profile?
5. What have you tried to do so far?
6. How are you testing the mail sending? From the commandline? From some mail client?
7. How about the logs? What do they say?

Let's get some of that answered and go from there...

Error messages or any returned mail and their errors would be helpful? We can't just assume what is wrong with it, were not psychic you know..

sendmail is up and running... he doesn't sendmail from shell, mail client, webmail and doesn't return error mails. I have RH9

There has to be something indicating if its not sending. What do your logs tell you? And what do you mean he doesn't sendmail from command, client or webmail? What or how are you sending mail then? Details please, you still have not provided any helpful information.

I mean I've tryed to sendmail from the shell webmail... and loging through a mail client(outlook) and is not sending mails.
PS: i can't send mails

where do I find senmail logs ?

Jan 7 20:23:41 nbasarab sendmail[1863]: i081NfWM001863: Authentication-Warning: nbasarab.ro: apache set sender to spank@nbas$
Jan 7 20:23:41 nbasarab sendmail[1863]: i081NfWM001863: from=spank@nbasarab.ro, size=508, class=0, nrcpts=1, msgid=<4239.213$
Jan 7 20:23:41 nbasarab sendmail[1865]: i081NfEM001865: from=<spank@nbasarab.ro>, size=719, class=0, nrcpts=1, msgid=<4239.2$
Jan 7 20:23:41 nbasarab sendmail[1863]: i081NfWM001863: to=<spank@nbasarab.ro>, ctladdr=spank@nbasarab.ro (512/512), delay=0$
Jan 7 20:23:42 nbasarab imapd[1862]: Logout user=spank host=dumbrava [213.233.122.101]

From what I get with your error of:

Jan 7 20:23:41 nbasarab sendmail[1863]: i081NfWM001863: Authentication-Warning: nbasarab.ro: apache set sender to spank@nbas$

According to some of the docs at sendmail: "Authentication Warnings add warnings about various conditions that may indicate attempts to spoof the mail system, such as using an non-standard queue directory."

Are you trying to send out as a different user or non-existent user, changed your domain in your email settings, etc?

not a user issue... how can I change my domain in my email setting ?

pfiu... I solved the problem. I had installed an antivirus for sendmail and it played with my sendmail.cf... fortunately i had a backup for that file and i replaced the bad cf.
Thank you!

It most likely was your domain name settings in the cf file, which is the only thing I can think of. Most likely changed it from what your actual host name or domain name is on your machine, etc.