This situation can be due to many different causes. So it's impossible to give a 100% precise answer. Still, review these situations:
- Are you using the correct outgoing server?
- Make sure you follow the instructions for incoming and outgoing servers
- Are you using "My outgoing server requires authentication"?
- You must use the same email username and password for the outgoing server
- Are you using the correct password?
- Is the username correct?
- Remember that your username to read your email is always your email address
- Are you using the correct port?
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Available ports for sending mail:
- 26 — No encryption - STARTTLS
- 465 — SSL/TLS
- 587 — No encryption - STARTTLS - SSL/TLS
- 25 — Best to avoid port 25 as many internet providers have it closed.
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Try to verify each of the above questions and open a ticket answering them and including the error shown by the email program you use. One of our technicians will help you resolve your problem.