[CentOS] sendmail security

John Hinton webmaster at ew3d.com
Wed Sep 20 16:54:38 UTC 2006

Alexander Dalloz wrote:
> John Hinton schrieb:
>>> On Wed, 2006-09-20 at 05:12, abhishek singh wrote:
>>>> yes i am using SMTP Authentication , but when i m
>>>> doing telnet to my server on 25 port so i am able to
>>>> send mail by unknow user that in in not my mail server
>>>> like
>>> [ snip ]
>> Do you have telnet open to the outside world? If so kill it and only 
>> allow ssh with the proper extra security setup. You may need to open 
>> telnet for a little while for testing purposes, but don't leave it 
>> that way.
> What has using the telnet client for testing a daemon on a tcp port to 
> do with running a telnet daemon?
> Answer: nothing.
>> John Hinton
> Alexander
My bad. I didn't know you could do that! I had always started the telnet 
service before even trying!

John Hinton

More information about the CentOS mailing list