Slow Send and/or Receive Emails on Outlook

In the case you experience slow sending and/or receiving of emails with Outlook 201x try one of the options below:

• Enable Outlook with Cache

  • 'Mail to keep online': set to 'All'

• Start Outlook in Safe modes (outlook.exe /safe)

• Or try with disable Outlook Cache

• Create a new Outlook Profile

• Does the computer has the latest patches/updates?

• Test account on another computer with Outlook

• Check your hard drive for bad sectors

• Temporary disable Anti-Virus , restart Outlook and try again

• Is domain complete installed / validated in Office 365 Admin center?

Other related (Microsoft) articles:

• My messages won't send

• How to troubleshoot performance issues in Outlook

• Microsoft Cloud / Microsoft Office 365 / Tips with Outlook connections issues

• Outlook 2016 autodiscover takes a long time to complete