You may get invalid certificate warning if you have the wrong address. Check you have exactly:
https://mai.vasudevaserver.net/
Pop Mail.
If you use pop mail, you must use mail.vasudevaserver.net as host. See: pop email settings
Ignoring Certificates.
If you think you have right address, but still get ‘certificate warning’ you can just click continue.
– Permanently Store Exception – for firefox.
Always Trust Safari
- click – view certificate
- Click – always trust certificate
