Outlook – Emails repeatedly being sent to recipients with an attachment in it

Try and increase the server time-out limit

Step 1. Click on Files

Step 2.  Click on Account settings > Account settings

Step 3. Double Click on the account

 

Step 4. Click on More Settings and then Advance tab

 

Step 5. To increase the Server Timeout, Under Server Timeout drag the Slider the way to your Right

Step 6. Click Ok

If you are still sitting with an issue after, Compress the File, File types that are reduced the most after zipping are text-oriented file types such as .doc, .txt, and .xls

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