Hi Everyone
Hope you all good, I'm a noob in here so please be nice :)
I'm currently having issue diagnosing an issue with our Exchange Server 2013.
Some external mails come through and some do not, and usually when senders are asked to resend only then do the mails come through.
I have check with our Spam filtering company and according to them they had not blacklisted these email addresses, in fact, we even when as far as whitelisting those certain email address/domains and still no luck.
The error message I'm getting in the delivery report is: [{LRT=};{LED=250 2.0.0 OK};{FQDN=};{IP=}]
Any help will be appreciated, thanks.