Hi Experts,
Please i need assistance on how to sort out an issue that iam facing at present with the mail flow of external emails
I have 4 exchange servers running on version 2013 and more than 1000 client users who are using the mail service.
However, i have been getting more requests from clients that they have not been receiving mails recently especially external ones. Internally, everything works fine, sending and recieving seem to be no problem. The problem now is with sending & receiving external emails that seem to be block somewhere.
From the Queue Viewer(Exchange toolbox), i can see that under Delivery type option, most are showing DnsConnector Delivery with the STATUS as RETRY & CONNECTING. opening up one message properties(General tab) - sender address rejected: Domain not found;0;CN=internet connector....................................................
Also an error recieved showing message delay and/or DNS query failed with error Error Retry.
Before i forgot, adding on the that, i have realised that on the exhange admin center there are 2 alerts iam receiving promting me to renew my mail dns name(with assigned services-IMAP,POP,IIS &SMTP) which will expire on the 08/08/2015. please advise if this might be the cause or to do with settings on the send and receive connectors under Mail Flow.
Really need assistance on this
Thanks
Kedesh