Recent DiscussionsMost RecentNewest TopicsMost LikesSolutionsTagged:TagRe: Not receiving emails from external senders.1.check the MX record is added in public DNS. 2.if public DNS is added, then do the Mail trace in your Exchange Admin, Direct link https://admin.exchange.microsoft.com/#/messagetraceUnable to see "open another mailbox" option in New exchange admin Hi, I was(as a admin) using "open another mailbox" option in New Exchange Admin to view others mailbox rules. but i don't find that option now. is it retired by Microsoft?