In our company, we use Outlook and add the zoho mail service to it. We have encountered a problem with long mail synchronization. Internet access is stable, we use all recommended settings, incl. ports, mail server addresses, etc. We have had folder synchronization for a long time and mail is loading very slowly, we switched to zoho mail and now we have such problems. In other email clients and in the web service, everything works well. Please give us support, as we cannot wait for a response via support mail and whatsapp and this affects our work. We use the domain finoco.com