I have got a problem in our e-mails system ( we can not recieve any e-mails from external addresses) that happend suddenly today.
I have exhange server 2003 with real ip address and at networksolutions.com I am pointing the address of my e-mail server.
today when I tried to send an e-mail from gamil I got a delivery failur and it said:
Technical details of permanent failure:
PERM_FAILURE: SMTP Error (state 9): 550-"The recipient cannot be verified. Please check all recipients of this
550 message to verify they are valid."
could anyone please help