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  1. SMTP Relay in office 365

    We've been using the Office 365 SMTP service from our server for a few months now.
    We started using option 1 (SMTP client submission) in the How to set up a multifunction device or application to send email using Office 365
    This option works, but does not perform well.

    https://support.office.com/en-us/article/How-to-set-up-a-multifunction-device-or-application-to-send-email-using-Office-365-69f58e99-c550-4274-ad18-c805d654b4c4?ui=en-US&rs=en-US&ad=US

    It takes 15-20 seconds to send each e-mail.
    We need to send e-mails to addresses outside the organisation, so option 2 (direct send) was not an option, so we tried option 3 (Office 365 SMTP relay). I followed the instructions in the article, setting up a connector in our office…

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    0 comments  ·  Exchange Admin  ·  Flag idea as inappropriate…  ·  Admin →

    That was By Design behaviour. Your endpoint points to Office 365 IP addresses shared by other customers. You were not in fact relaying by sending directly to those customers as the messages could be delivered by us for the mailboxes hosted in Office 365. For the external mailboxes, it failed like you saw because the connector was not working.

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