SBS2008 + Exchange2007 External mail is being received perfectly normally. The only issue I have is with mail from an internal smtp program called Postie.exe. It stopped working a few months ago.
The Postie program is being used by our manufacturing database application. It sends emails to internal users to notify them about various issues within the database.
When look at the Exchange smtp receive log, I see something like this:
*,SMTPSubmit SMTPAcceptAnyRecipient SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender AcceptRoutingHeaders,Set Session Permissions
>,"220 ourserver.ourdomain.co.uk Microsoft ESMTP MAIL Service ready at Fri, 21 Apr 2017 11:58:01 +0100",
>,250-ourserver.ourdomain.co.uk Hello [192.168.16.51],
>,250 2.1.0 Sender OK,
<,"RCPT TO:<email@example.com> NOTIFY=DELAY,FAILURE ORCPT=rfc822;firstname.lastname@example.org",
>,250 2.1.5 Recipient OK,
>,354 Start mail input; end with <CRLF>.<CRLF>,
>,250 2.6.0 <email@example.com> Queued mail for delivery,
>,221 2.0.0 Service closing transmission channel,
To me, that looks ok but email from the postie program never reaches it's destination these days. I don't know what changed. Can anyone help?