Trouble sending mail to some domains

HCL Domino Domino Forum
1

We are having problems to send mails to some domains.I think it started on monday maybe on the weekend.

We get those error messages in Notes LOG:

01/31/2008 10:39:06 AM Router: Failed to connect to SMTP host OSSLOGIN.COM because 221 [209.136.105.154]

It’s just an example. There many different domains which seem to allow a smtp connection but directly afterwards terminating it.

I did not change anything in DNS in last week and for me everything seems to be fine (reverse dns for example).

Any ideas?

2

Subject: Trouble sending mail to some domains

The 221 is supposed to be the error code : beginning by 2 so no error, everything is fine.

Could you try and perform a manual SMTP session with telnet from your relay and post the result ?

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Subject: RE: Trouble sending mail to some domains

Yes, 221 is not an error message - but the mails don’t get delivered to the customer and our employees get a Non Delivery Report.221 should be a message seen at the successful end of a smtp transmission but it is not successful.

A manual telnet seems to connect but I cannot submit commands (no reaction is seen).

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Subject: RE: Trouble sending mail to some domains

if you only don’t see the command you are typing, perhaps you simply don’t have the localecho activated.

If it’s a W32 server, open telnet without argument.

At the telnet prompt enter set localecho then “o [the server address] 25”

you should then see your commands properly

if you have absolutely no reaction, then I don’t see what to add, sorry

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Subject: RE: Trouble sending mail to some domains

I have an update:After posting my last comments I took a look at my telnet session which gave no responses to me.

And…

I got responses but delayed and the problem is:

We have a firewall with a proxy for smtp and this one tried to connect to the remote site but it couldn’t because the smtp server on the remote site seems to have problems.

So I got the smtp error message on command line but the last message from the smtp proxy of the firewall is 221 because it is going to shut down smtp connection…

So I get a 221 error message in the log. :frowning: