Thank you for your fast response. I executed the Synametrics Email Sender FX

- TO; aXXg@aXXiXg.com (valid mailbox on the exchange server)

- Subject; Test Synametrics Email Sender

- Email content; Test

- SMTP Server; 192.168.XXX.XXX (Exchange server IP)

- Sender's Name; AG

- Sender's Email; aXXg@aXXiXg.com

Got the following result in the SMTP Log (i did receive a e-mail in the corresponding inbox) :

22-11-17 21:54 - [ 2] ************ New connection to: 192.168.XXX.XXX
22-11-17 21:54 - [ 2] C --> 220 XXX.aXXiXg.com Microsoft ESMTP MAIL Service ready at Wed, 22 Nov 2017 21:54:07 +0100
22-11-17 21:54 - [ 2] S <-- EHLO PXXDXOR.aXXiXg.local
22-11-17 21:54 - [ 2] C --> 250-XXX.aXXiXg.com Hello [192.168.XXX.23]
22-11-17 21:54 - [ 2] C --> 250-SIZE
22-11-17 21:54 - [ 2] C --> 250-PIPELINING
22-11-17 21:54 - [ 2] C --> 250-DSN
22-11-17 21:54 - [ 2] C --> 250-ENHANCEDSTATUSCODES
22-11-17 21:54 - [ 2] C --> 250-STARTTLS
22-11-17 21:54 - [ 2] C --> 250-X-ANONYMOUSTLS
22-11-17 21:54 - [ 2] C --> 250-AUTH NTLM
22-11-17 21:54 - [ 2] C --> 250-X-EXPS GSSAPI NTLM
22-11-17 21:54 - [ 2] C --> 250-8BITMIME
22-11-17 21:54 - [ 2] C --> 250-BINARYMIME
22-11-17 21:54 - [ 2] C --> 250-CHUNKING
22-11-17 21:54 - [ 2] C --> 250-XEXCH50
22-11-17 21:54 - [ 2] C --> 250-XRDST
22-11-17 21:54 - [ 2] C --> 250 XSHADOW
22-11-17 21:54 - [ 2] S <-- STARTTLS
22-11-17 21:54 - [ 2] C --> 220 2.0.0 SMTP server ready
22-11-17 21:54 - [ 2] ************ New (secure) connection to: 192.168.XXX.XXX
22-11-17 21:54 - [ 2] S <-- EHLO PXXDXOR.aXXiXg.local
22-11-17 21:54 - [ 2] C --> 250-XXX.aXXiXg.com Hello [192.168.XXX.23]
22-11-17 21:54 - [ 2] C --> 250-SIZE
22-11-17 21:54 - [ 2] C --> 250-PIPELINING
22-11-17 21:54 - [ 2] C --> 250-DSN
22-11-17 21:54 - [ 2] C --> 250-ENHANCEDSTATUSCODES
22-11-17 21:54 - [ 2] C --> 250-AUTH NTLM LOGIN
22-11-17 21:54 - [ 2] C --> 250-X-EXPS GSSAPI NTLM
22-11-17 21:54 - [ 2] C --> 250-8BITMIME
22-11-17 21:54 - [ 2] C --> 250-BINARYMIME
22-11-17 21:54 - [ 2] C --> 250-CHUNKING
22-11-17 21:54 - [ 2] C --> 250-XEXCH50
22-11-17 21:54 - [ 2] C --> 250-XRDST
22-11-17 21:54 - [ 2] C --> 250 XSHADOW
22-11-17 21:54 - [ 2] S <-- MAIL FROM:<aXXg@aXXiXg.com>
22-11-17 21:54 - [ 2] C --> 250 2.1.0 Sender OK
22-11-17 21:54 - [ 2] S <-- RCPT TO:<aXXg@aXXiXg.com>
22-11-17 21:54 - [ 2] C --> 250 2.1.5 Recipient OK
22-11-17 21:54 - [ 2] S <-- DATA
22-11-17 21:54 - [ 2] C --> 354 Start mail input; end with <CRLF>.<CRLF>
22-11-17 21:54 - [ 2] C --> 250 2.6.0 <32143133.1.1511384047544@PXXDXOR.aXXiXg.local> [InternalId=1] Queued mail for delivery
22-11-17 21:54 - [ 2] S <-- QUIT
22-11-17 21:54 - [ 2] C --> 221 2.0.0 Service closing transmission channel
22-11-17 21:54 - [ 2] ~~~~~~~~~~~~ Connection Terminated ( 1891)