Router: Failed to connect to SMTP hos

Notes/Domino 8 Forum

Subject:

These errors indicated that there is a connection problem between Domino and the destination SMTP Host and Domino cannot connect and complete the SMTP conversation. But because the router could send messages to other domains and receive messages inbound indicated that the router and SMTP listener task were functioning well and there was a good network connection to the internet. So it was only certain outbound connections that Domino had an issue with.

The fact that eventually the messages do get sent to the internet successfully suggested that it is not a configuration issue on Domino's side but possibly a temporary connection or networking issue. That it was very likely that there is a DNS issue as Domino passes the outbound destination internet domain to the DNS Service to resolve. If the DNS service is unreliable and temporarily unavailable then Domino
outbound SMTP mail routing will stop functioning too.

Using Windows DOS command to TELNET to one of the hosts mentioned in the error messages using port 25, and when issuing "HELO" and "MAIL FROM" SMTP commands, an error message appeared indicating that the customer's domain is Black Listed by that destination internet domain, as in the following example:

TELNET [Remotehost.com] [PORT]

HELO MyHost

MAIL FROM: <Sender's E-mail Address>

verify that no message indicating that MyHost or the ip address of MyHost is not Black Listed or other error messages

Feedback response number WEBB7KJQ5U created by ~Bella Xanponepulnivu on 10/18/2008

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SMTP and delay problems after serve... (~Gus Renumarets... 16.Oct.08)

. . Router: Failed to connect to SMTP h... (~Mark Kikisonod... 18.Oct.08)

. . . . SSL port active for SMTP (~Gus Renumarets... 7.Nov.08)

. . . . . . SSL Port is Disabled Please Help (~Fred Lopnilita... 7.Oct.10)

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