So, be very technically proficient before proceeding with the step. Can receive email but when trying to send email it goes to the ou, About activeSync v14.0 ,Sendmail status code is 110, means unknown server error. This will definitely help you out to resolve the issue at the earliest. An error like these can create a hurdle in your email communication. Outlook Mac Error Code 3253 - Oplossing Volg de onderstaande stappen om de Outlook-foutcode 3253 op uw Mac te herstellen. This problem is related to the connection to the server.