MIJS,
Go to System > IP Settings > DNS Searchlist: change it to mijs.com as it is probably blank.
For some reason most vendors do not change this and I am not sure as to why.
Next, go to System > E-Mail Gateway
Verify that the following:
Administrator E-Mail: voicemail@mijs.com
E-Mail Address: voicemail@mijs.com
E-Mail Real Name: Voice Mail
E-Mail Username: voicemail@mijs.com
Gateway Password: verify that it is the correct password for voicemail@mijs.com
Thanks,
TE