Hi Hillsgal,
Is this a problem that has only recently occurred?
What’s the size of your PST files? If your PST files is too large, you can considering archive it if possible.
The antivirus program may also cause the delay, it is suggested to temporarily turn off antivirus program, and then send a test email again.
Besides, “Schedule an automatic send/receive every n minutes” option can also cause this issue, you can
set the interval for automatic receiving/sending to be shorter.
Regards,
Aidan Wang
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