Exchange is simply told to accept emails from the connection and relay them onward to the target so no you cannot in exchange at least see it in the traditional way of a sent items folder.
Office 365 smtp relay sent items.
Microsoft 365 or office 365 smtp relay is very similar to direct send except that it can send mail to external recipients.
Split from this thread.
Messages that are sent by using smtp authenticated submission protocol will now behave in the same way as other submission protocols in office 365 such as the protocol that is used when emails are sent by using outlook on the web.
Opting for an office 365 smtp relay has the additional benefits of not requiring a separate licensed office 365 mailbox to send.
I have exact same frustrating situation.
Hi marius hope you found a solution.
And are willing to share.
As a result the sender s office 365 display name will now be shown as part of the from address.
Smtp simple mail transfer protocol is used when you set up an on premises multi function printer scanner fax or line of business lob application that needs to send email.
Email for help creating and sending email email in microsoft 365 for business admin help fix outlook and microsoft 365 problems with microsoft support and recovery assistant email non delivery reports exchange online help.
If you need assistance with a task or if you are troubleshooting a problem you might find the following articles helpful.
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Smtp relay client smtp submission or direct send.
Due to the added complexity of configuring a connector direct send is recommended over microsoft 365 or office 365 smtp relay unless you must send email to external recipients.