Office for Mac 2016 - Error Code -3253 - Microsoft Community


email has been working fine week, today, error code -3253 connection server failed or dropped

nothing has changed in settings, can't retrieve or send emails.

can offer guidance?

hi all,

i had issue today , fixed this.

run update!

  1. inside outlook - >check updates
  2. download , apply updates office products, not outlook.
  3. outlook 15.34 current @ time of post
  4. close outlook installation
  5. open outlook
  6. edit connection settings - outlook > preferences > accounts
  7. find mail profile issue
  8. check spelling of incoming , outgoing mail servers - eg mail.domain.com
  9. tick "use ssl" incoming , out
  10. check ports 993 , 465
  11. if not above, click override tick box , type them in - 993 , 465
  12. it doesn't matter if mail server accepts secure connections or not, try connect securely then fall insecure port 25 if needed.
  13. click more settings button
  14. authentication - use incoming settings
  15. ok main screen
  16. click send n receive
  17. accept certificate pop ups - yes trust type messages


Office / Outlook / Mac / Office 365 for business



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