Hi,

I have installed redhat 9.0 linux box with sendmail 8.12.9. I have frequently getting relaying denied in the maillog.

The logs given below:
*************************
Mar 21 08:53:45 bics sendmail[18276]: j2L3MZms018276: ruleset=check_rcpt, arg1=<4ieh123n@yahoo.com.tw>, relay=[166.114.30.40], reject=550 5.7.1 <4ieh123n@yahoo.com.tw>... Relaying denied. IP name lookup failed [166.114.30.40]
Mar 21 08:53:45 bics sendmail[18277]: j2L3Mfmq018277: ruleset=check_rcpt, arg1=<6041a@ms4.hinet.net>, relay=[166.114.30.40], reject=550 5.7.1 <6041a@ms4.hinet.net>... Relaying denied. IP name lookup failed [166.114.30.40]

1. I want to know whether my sendmail server is a open relay or not.

2. How to restrict the relaying denied error..?


Hope i will get the solution thanks...

Regards
Baskar T

Looks like someone may be trying to use your box as an open relay, but the fact that it is being denied is a good sign. You should check your /etc/mail/access file. IIRC by defauly the sendmail shipped with RH9 will only route mail to/from the localhost and for domains specified in the access database (you'll need to rebuild access.db via makemap if you modify this file). You can also test your mail server by telnetting to port 25 and attempting to send mail from some random domain not serviced by your mail server to another random domain not serviced by your mail server.

Finally, if you're running RH9 in a server capacity, please make sure you have all relevant updates from red Hat and the Fedora legacy project installed.

Hi btmiller,

Thanks for ur reply.

I have few doubts..


1. I would like to avoid those errors in the maillog. How to do?
2. Is there any method to restrict open relay in sendmail.


thanks in advance.

Regards
Baskar ST