troubleshooting Question

Lotus Notes SMTP - No verifiable sender address in message headers

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EBIZ-Mark asked on
Lotus IBMEmail Protocols
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This is the message we receive when sending from Notes client

"SMTP Protocol Returned a Permanent Error 550 No verifiable sender address in message headers"

We have Lotus Notes 7 Domino Server.

We have recently introduced a new email domain name, so that each user has a new email address. The users ID files are still the same, but their email address and short name in the names directory have been updated to use the new domain name.
Their location documents on the client reflect these changes too.

We have been able to send and receive emails to the new domain for a few days now, but today every outgoing email is being rejected with the message "No verifiable sender address in message headers".

The server console doesn't show that any documents are physically being sent to our external ISP mail gateway, i.e. "0 messages sent", then we receive the rejection message.

The GlobalDomain document has the new domain as an alias to the previous domain in the Conversions tab, and in the server configuration settings SMTP has no restrictions setup, the Inbound Controls are:
 * on Deny messages to be sent....,  
Allow messages only to be sent to the following internet hosts.... lists the two domain names, old and new.
Outbound Controls : none

We're at a loss as to what has caused this to stop working. No changes to our Notes server in the past few days.

Thanks in advance

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