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Article ID: 132054, created on Jan 12, 2018, last review on Jul 14, 2018

  • Applies to:
  • Business Automation 7.2


Customer is using external SMTP server. Notifications are not sent due to error message:

"Unexpected error code"

To know where this error message is received from (BA or SMTP server) it is required to use the comand below on attempt to resend failed e-mail from PCP to determine which exact parameters are passed to SMTP:

tcpdump -vv -x -X -s 1500 -i eth1 'port 25' 

In "tcpdump" output It is required to find FQDN hostname:

EHLO <FQDN hostname>

Usually BA sends FQDN hostname of application node to SMTP server. This is a demand of RFC 5321:

"The domain name given in the EHLO command MUST be either a primary host name (a domain name that resolves to an address RR), or, if the host has no name, an address literal."

After FQDN hostname is checked try to send e-mail via "telnet" command:

telnet <SMTP server hostname> 25
EHLO <FQDN hostname>
MAIL FROM: <e-mal address of sender>
RCPT TO: <e-mail address of receipient>
Subject: some test subject
some text

In this case on one of the steps error message will be received from SMTP server with error code. For example: 553 - domain authentication fail

If error occured during sending e-mail via telnet the issue is on SMTP server side.


SMTP server configuration is out of Odin Technical Support Scope. Please contact SMTP server administrator to resolve the issue.

See also: - How to check outgoing mails.

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