I apologize if this has been addressed elsewhere; I am a completely newbie to DNS. Unfortunately I do not know anything about the servers or firewalls or any other specifics other than what I mention below.
We have a client with the domain company.com. In order for our supporting employees to use a similar email address, we asked the client to setup a sub domain such as sub.company.com. We also asked them to setup a CNAME record pointing to fbc0de12-3456-7890-f123-g4
ny.com with a value of admin.messaging.microsoft.
com; and an MX record pointing to mail.messaging.microsoft.c
om. We also asked them to setup an A record pointing to one of our marketing websites.
The client set this up on both their internal and external DNS. The problem is that it works intermittently – 1 out of 10 tries works, to either email or hit the sub domain (as sub.company.com or www.sub.company.com
). We have had other clients set this up successfully and it does not appear that there is any difference between this client’s setup and other clients’ setups.
Any ideas on why this would be working intermittently?
Thank you in advance -