Sorry for the delay. Based on your config, you authenticate to AD using the samAccountName and also return the mappedAttribute. Since these values are unaffected by your upcoming change, you are good there.
The other concerns are:
1. The ARS_LDAP_BIND_DN, currently you show a psuedo example of CN=binduser,OU=Generic,OU=Users,OU=ouname,DC=dcname,DC=pri
I wonder if this is going to change to
CN=binduser,OU=Generic,OU=Users,OU=ouname,DC=emaildomain,DC=com
2. As in the previous comment you show a ARS_LDAP_BASE_DN of ouname,DC=dcname,DC=pri. I wonder if this will also change to something like
ouname,DC=emaildomain,DC=com
You should check with your AD admin as these changes would in fact break authentication.
Lastly, you probably already know this, CMOD 9.5 is officially out of support. Hopefully you either have extended support or plan on upgrading real soon.
Thanks,
Rob