Outlook for Mac Error Code 3253 : Fix It Here!

Responsible Factors for Mac Outlook Error Code 3253

• It might be possible that you have large number of emails in sent emails folder. It put an extra stress on client-server communication and results in error code 3253. Due to continuous pressure on server, it disconnects permanently and did not send emails at all.
• The other possible reason could be incorrect setup of Outlook account on the client’s machine. This can be fixed easily just by providing right details.
• If any of the above is not the cause of Outlook for Mac error code 3253, then corruption is the only reason behind this error.

Multiple Workarounds to Fix Outlook for Mac Error 3253

Workaround #1: Change Port Number

Workaround #2: Create a New Account

• On your Mac machine, move to the Applications
• Then, right-click on Microsoft Outlook and click on the Show Package Contents option
• After that, you need to move to the Contents → Shared Support → Outlook Profile Manager and double-click on it.
• Now, click on the Create a new profile. Then, enter your new profile name
• Next, simply click on the Add account button
• Here, you need to select the Account type → Another email → IMAP/POP.
• At last, enter the correct account details and click on the Add account option

Workaround #3: Clean Old & Cached Preferences

1. First of all, open the Terminal app on Mac machine
2. After that, type “defaults delete com.microsoft.Outlook” including quotes in the Terminal. It will delete your old Outlook preferences
3. Then, to delete the cached preferences you need to type killall cfprefsd in Terminal. It will kill the cached preferences.
4. 
5. After that, start Mac Outlook 2016 again.

Pro Tip: Remove Corruption from Mac Outlook File

Conclusion