Ehlo is failing

Hello,

unfortunately after a server change the plugin does not work anymore. We send via SMTP – the settings are correct. But I get the following error during a test.

`
Server:
OpenSSL: OpenSSL 1.1.1 11 Sep 2018
SMTP Debug:

2020-02-11 10:45:25 Connection: opening to smtp.office365.com:587, timeout=300, options=array ( )
2020-02-11 10:45:25 Connection: opened
2020-02-11 10:45:25 SERVER -> CLIENT: 220 ZRAP278CA0018.outlook.office365.com Microsoft ESMTP MAIL Service ready at Tue, 11 Feb 2020 10:45:25 +0000
2020-02-11 10:45:25 CLIENT -> SERVER: EHLO http://www.mydomain.com/dede 2020-02-11 10:45:30 SERVER -> CLIENT: 501 5.5.4 Invalid domain name [ZRAP278CA0018.CHEP278.PROD.OUTLOOK.COM]
2020-02-11 10:45:30 SMTP ERROR: EHLO command failed: 501 5.5.4 Invalid domain name [ZRAP278CA0018.CHEP278.PROD.OUTLOOK.COM]
2020-02-11 10:45:30 CLIENT -> SERVER: HELO http://www.mydomain.com/dede 2020-02-11 10:45:35 SERVER -> CLIENT: 501 5.5.4 Invalid domain name [ZRAP278CA0018.CHEP278.PROD.OUTLOOK.COM]
2020-02-11 10:45:35 SMTP ERROR: HELO command failed: 501 5.5.4 Invalid domain name [ZRAP278CA0018.CHEP278.PROD.OUTLOOK.COM] 2020-02-11 10:45:35 CLIENT -> SERVER: STARTTLS
2020-02-11 10:45:40 SERVER -> CLIENT: 503 5.5.2 Send hello first [ZRAP278CA0018.CHEP278.PROD.OUTLOOK.COM]
2020-02-11 10:45:40 SMTP ERROR: STARTTLS command failed: 503 5.5.2 Send hello first [ZRAP278CA0018.CHEP278.PROD.OUTLOOK.COM]
2020-02-11 10:45:40 SMTP Error: Could not connect to SMTP host. 2020-02-11 10:45:40 CLIENT -> SERVER: QUIT
2020-02-11 10:45:40 SERVER -> CLIENT: 221 2.0.0 Service closing transmission channel 2020-02-11 10:45:40 Connection: closed
2020-02-11 10:45:40 SMTP Error: Could not connect to SMTP host.
‘
FYI: I changed the real Domain to mydomain.com just in this post.

I suspect the problem is the “Ehlo” call.
The address mydomain.com/dede/ looks incorrect, but I can’t find where to change it.