[Asterisk-Users] vm email notifications

[firedude at shorelinuxsolutions.com]

On my asterisk server I have placed valid email addresses in the 
voicemail.conf file as to allow mailbox users to receive message 
notification. My problem is it appears that the messages are attempting to 
be sent but instead they are bouncing with a fatal error message like the 
one below:

 (reason: 550 [PERMFAIL] yahoo.com requires valid sender)

First of all this is not the whole message but I think the pertinent part 
of it.  What's really odd is that I can send mail out fine using pine, 
nothing bounces, also on my other asterisk service at another location 
this feature works fine.  I use sendmail as my MTA.  Is there anybody who 
has had a similar problem or who might be able to give me a suggestion as 
to how to correct this problem.  Thanks
AJ