Reverse DNS entry issue

HCL Domino Domino Forum
1

Hello all,

I have a problem with my Domino 6.5 smtp server, it does not accept emails from some servers and after checking the ip-address in the log at dnsstuff.com, I found that all those gave the following result:

xxx.xxx.xxx.xxx has no reverse DNS entry; some mail servers may not accept your mail.

How can I get Domino to accept emails from these servers?

The SMTP inbound settings are:

DNS Blacklists: bl.spamcop.net; sbl.spamhaus.org; dynablock.easynet.nl

Verify connecting hostname: disabled

Verify senders domain: disabled

The log file says:

2003-10-30 21:42:37 SMTP Server: xxx.xxx.xxx.xxx connected

2003-10-30 21:42:37 SMTP Server: xxx.xxx.xxx.xxx disconnected. 0 message[s] received

Any help would be greatly appreciated, thanks

/Marcus

2

Subject: reverse DNS entry issue

server configuration documentrouter/smtp

restrictions and controls

smtp inbound controls

Verify connecting host name in DNS = DISABLED

if you have this enabled then domino will do reverse dns lookups on the connecting ip address

3

Subject: RE: reverse DNS entry issue

Thanks, but as I wrote in the first message in this thread, “Verify connecting hostname in DNS” is already disabled.

/Marcus

4

Subject: RE: reverse DNS entry issue

sorry, missed that.

if you haven’t then can you change the logging to VERBOSE it should give you a domino reason as to why no message was received or was rejected.

what about ‘verify recipient exists in local directory’? do you have that enabled? that will reject messages.

either way domino should be telling you why it rejected a message (if the log level is high enough)

5

Subject: reverse DNS entry issue

Have you populated the field “Deny messages from the following internet addresses/domains”? If you have populated this field, domino do a reverse lookup to know if the server is local or not (http://www-1.ibm.com/support/docview.wss?uid=swg21098121)

Perhaps this is the reason of your problem

I hope it can help you

6

Subject: RE: reverse DNS entry issue

Thanks for the suggestion.I used to have a domain listed there but I’ve cleared it, no effect on this problem unfortunately.

/Marcus

7

Subject: RE: reverse DNS entry issue

2003-10-30 21:42:37 SMTP Server: xxx.xxx.xxx.xxx connected2003-10-30 21:42:37 SMTP Server: xxx.xxx.xxx.xxx disconnected. 0 message[s] received

Are you sure that xxx.xxx.xxx.xxx want to deliver a message, and is not simply scanning your ports? Because the SMTP server will respond to any connect request on port 25.

Maybe you can check your firewall logs to see if more ports were scanned at that time?

8

Subject: reverse DNS entry issue

I suggest Disable DNS blackfilter & restart smtp task.

9

Subject: RE: reverse DNS entry issue

Thanks, but I tried that earlier with no effect.

/Marcus