Cannot receive email from some domain
my company is using windows server 2003 + exchange 2003 .. we have 3 domains with 1 fixed IP in the server ...but this 3 domain DNS hosting in 3 different dns hosting company . we are facing a problem that 1 of the domain cannot receive email from some domains. for sure, it can receive emails normally some many domain. i have tried to change DNS hosting company but still having same problem. also this 3 domain also secure by the same spam and anti-virus application in the server. pls help .. many many thank you!
ASKER
Dear tigtermatt, Thank you so much for your reply.
actually, the sender do not receive any error messages (NDR) after they sent out the email to our domain. which mean they don't know they cannot send email to our domain. they also create an account for me and i have tried to use this account by webmail to send email to our domain and proved no any error return and of cos our domain also cannot receive anything. but it work if i use outlook with my local smtp server. is there any tools can test thier domain and our domain ? thank you!
actually, the sender do not receive any error messages (NDR) after they sent out the email to our domain. which mean they don't know they cannot send email to our domain. they also create an account for me and i have tried to use this account by webmail to send email to our domain and proved no any error return and of cos our domain also cannot receive anything. but it work if i use outlook with my local smtp server. is there any tools can test thier domain and our domain ? thank you!
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It would be useful if you could give us an NDR which is received by the sending domain.