Here are some suggestions to why your email account may not be compatible with certain emails clients:
- Make sure you have the correct login credentials
- Check with your system administrator or IT support person
- They can verify the correct settings for your email account.
- Confirm the email client you are trying to use is supported by the email platform you are using
- Make sure you are running the most up-to-date version of the email client
- Verify the SMTP port for incoming and outgoing mail is correct
- If all else fails, try creating a new email account with the email platform
If you have exhausted all of these steps, then you may want to consult with the emails provider.