Since emClients inception it has always had a problem with passwords, today I installed the Mac version and nothing has changed, the correct password is rejected and I feel that I have wasted enough of my time on this issue. When you finally get it working right I will take a look, but with over 13,000 people complaining of this issue I try doubt that anyone is really paying attention.
The password can be rejected when you don’t have the correct combination of port and security policy.
Who is your email provider? Maybe I can suggest a combination that will work for you.