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.
Office 365 smtp relay sent items.
When you send emails through an office 365 connector it is relayed through office 365.
If some or all of your mailboxes are in office 365 there are a few options available.
Hi marius hope you found a solution.
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.
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Opting for an office 365 smtp relay has the additional benefits of not requiring a separate licensed office 365 mailbox to send.
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If you need assistance with a task or if you are troubleshooting a problem you might find the following articles helpful.
I have exact same frustrating situation.
As a result the sender s office 365 display name will now be shown as part of the from address.
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.
For the majority of cases the office 365 smtp relay option proves to be the best and most flexible choice as the other two options have requirements and limitations that often prove to prevent an optimal utilization.
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