My problem is not SMTP related.
I have a test table with 4 records and a membertable with over 900 records.
All the emails form both the tables are sent.
The reason it skipped 1 was something with the emailaddress.
The real problem is that when sending the emails from a recordset it does not get the data from the records, only the emailadresses loop.
So when I want to put for example the names and other information from the recordset in the message it only uses the data from the first record.
So it sends all the emails with the data from the first record.
I know it worked in UE3 before when I did some tests some time ago but did not use it any further.
But now I have to handcode the code in the waue_mail.php and replace all the recordnames with $RecipArray[$RecipIndex]