SMTP - of_sendmail

Hi all,

We have implemented the of_sendmail smpt function from Roland's topwhiz site. Thanks Roland !

This works great for 2 customers. Today we tried to activate this function for the 3th customer , but our app just hangs.

I have enabled the smtp tracing log and this is what i get

of_SendMail Start: 24/02/2016 11:11:59

220 (blanked out) Microsoft ESMTP MAIL Service ready at Wed, 24 Feb 2016 11:12:00 +0100

HELO (blanked out)

250 (blanked out) Hello [blanked.out]

MAIL FROM:<our email addy comes here>

250 2.1.0 Sender OK

RCPT TO:<internal mail address comes here>

250 2.1.5 Recipient OK

DATA

354 Start mail input; end with <CRLF>.<CRLF>

I am far from a SMTP specialist, so any idea's , comments , ... ?

TIA

John