SSL connection failed (certificate failed: self signed certificate (18))
- From POP Peeper's main menu, select Tools / PPtweaker
- Select the Certificates page
- Type your email server address on a separate line (you may need to add your SMTP address if it's different); e.g. mail.example.com
- Press OK
This error is most common with personal domains. If you receive this error with a major ISP or email service, then it may indicate an issue with your local certificates; contact support for help.
If you knowingly have a self-signed certificate, then you will need to add an exception for your mail host: