
@ Ref : EHA/End User Self Help/Common IT Services setup
These steps are mandatory for our mail server as return receipts are interpreted as spam by our smtp server. This might be a bug in Outlook as it happens exclusively in Outlook. Not following the steps outlined below, will ensure that your outgoing email is blocked by invisible return receipts cooling their heels in the Outbox which can be a veritable nightmare. Another option is to set-up your email in Thunderbird.
Click on Tools > Options
On the Prerences Tab, click on Email Options

Next, Click on Tracking Options

Under Read Receipts, (towards the end), click on Never send a response and click OK
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