公司使用office 365 e3，最近在做遷移，由於exchange online 暫時遷移排後，所以就準備sharepoint online，在sharepoint online 中可以邀請用戶加入站點，簡單的功能，但是sharepoint online 管理員說用戶無法收到郵件。
最快的方法開case 找微軟工程師，和微軟工程師一起檢查如下項目
1：sharepoint online 郵件發送，其實就是使用exchange online 發送
2：在郵件網關添加sharepoint online ip
IP ADDRESS RANGES | URLS |
|---|---|
42.159.34.0/27 | *.sharepoint.com |
42.159.38.0/23 | *.sharepointonline.com |
42.159.162.0/27 | |
42.159.166.0/23 | |
65.52.45.0/24 | |
65.55.22.32/27 | |
70.37.151.64/27 | |
94.245.113.160/27 | |
104.146.0.0/15 | |
111.221.17.160/27 | |
111.221.20.128/25 | |
111.221.22.32/27 | |
111.221.22.192/27 | |
111.221.64.160/27 | |
111.221.67.0/27 | |
111.221.67.32/27 | |
111.221.67.64/27 | |
111.221.67.96/27 | |
134.170.200.0/23 | |
134.170.202.0/23 | |
134.170.204.0/23 | |
134.170.206.0/23 | |
134.170.208.0/23 | |
134.170.210.0/23 | |
134.170.212.0/23 | |
134.170.214.0/23 | |
134.177.0.0/16 | |
157.55.43.32/27 | |
157.55.46.128/27 | |
157.55.56.0/27 | |
157.55.62.96/27 | |
157.55.62.128/27 | |
157.55.103.0/27 | |
157.55.144.64/27 | |
157.55.144.96/27 | |
157.55.145.192/27 | |
157.55.147.0/27 | |
157.55.152.128/27 | |
157.55.152.160/27 | |
157.55.152.192/27 | |
157.55.152.224/27 | |
157.55.153.0/27 | |
157.55.153.64/27 | |
157.55.153.96/27 | |
157.55.154.64/27 | |
157.55.225.160/27 | |
157.55.225.224/27 | |
157.55.227.128/27 | |
157.55.229.0/27 | |
157.55.229.32/27 | |
157.55.229.64/27 | |
157.55.229.96/27 | |
157.55.229.160/27 | |
157.55.231.32/27 | |
157.55.232.0/27 | |
157.55.235.64/27 | |
157.55.238.128/27 | |
157.56.24.128/27 | |
157.56.48.0/27 | |
157.56.80.128/27 | |
157.56.81.192/27 | |
157.56.81.224/27 | |
157.56.113.0/27 | |
157.56.132.128/27 | |
157.56.132.160/27 | |
157.56.150.32/27 | |
191.232.0.0/23 | |
191.234.8.0/23 | |
191.234.10.0/23 | |
191.234.12.0/23 | |
191.234.14.0/23 | |
191.234.76.0/23 | |
191.234.128.0/21 | |
191.234.144.0/23 | |
191.234.148.0/23 | |
191.234.150.0/23 | |
191.234.152.0/23 | |
191.235.0.0/20 | |
207.46.203.128/27 | |
213.199.179.0/27 | |
2a01:111:f402::/64 | |
2a01:111:f402:a000::/64 | |
2a01:111:f402:a001::/64 | |
2a01:111:f402:a002::/64 | |
2a01:111:f402:a003::/64 | |
2a01:111:f402:a004::/64 | |
2a01:111:f402:a006::/64 | |
2a01:111:f402:a800::/64 | |
2a01:111:f402:a801::/64 | |
2a01:111:f402:a802::/64 | |
2a01:111:f402:a803::/64 | |
2a01:111:f402:a805::/64 | |
2a01:111:f402:b000::/64 | |
2a01:111:f402:c00::/64 | |
2a01:111:f402:c01::/64 | |
2a01:111:f402:1::/64 | |
2a01:111:f402:1c00::/64 | |
2a01:111:f402:180a::/64 | |
2a01:111:f402:180b::/64 | |
2a01:111:f402:180c::/64 | |
2a01:111:f402:340a::/64 | |
2a01:111:f402:340b::/64 | |
2a01:111:f402:340c::/64 | |
2a01:111:f402:400::/64 | |
2a01:111:f402:800::/64 | |
2a01:111:f402:940b::/64 | |
2a01:111:f402:940c::/64 | |
2a01:111:f402:940d::/64 | |
2a01:111:f402:1000::/64 | |
2a01:111:f402:1001::/64 | |
2a01:111:f402:1801::/64 | |
2a01:111:f402:1802::/64 | |
2a01:111:f402:1803::/64 | |
2a01:111:f402:1804::/64 | |
2a01:111:f402:1805::/64 | |
2a01:111:f402:1806::/64 | |
2a01:111:f402:1807::/64 | |
2a01:111:f402:1808::/64 | |
2a01:111:f402:1809::/64 | |
2a01:111:f402:2400::/64 | |
2a01:111:f402:2401::/64 | |
2a01:111:f402:2403::/64 | |
2a01:111:f402:3400::/64 | |
2a01:111:f402:3402::/64 | |
2a01:111:f402:3403::/64 | |
2a01:111:f402:3404::/64 | |
2a01:111:f402:3405::/64 | |
2a01:111:f402:3406::/64 | |
2a01:111:f402:3407::/64 | |
2a01:111:f402:3408::/64 | |
2a01:111:f402:3409::/64 | |
2a01:111:f402:8001::/64 | |
2a01:111:f402:8002::/64 | |
2a01:111:f402:8003::/64 | |
2a01:111:f402:8004::/64 | |
2a01:111:f402:8005::/64 | |
2a01:111:f402:8006::/64 | |
2a01:111:f402:8007::/64 | |
2a01:111:f402:8800::/64 | |
2a01:111:f402:8801::/64 | |
2a01:111:f402:8802::/64 | |
2a01:111:f402:9400::/64 | |
2a01:111:f402:9401::/64 | |
2a01:111:f402:9402::/64 | |
2a01:111:f402:9403::/64 | |
2a01:111:f402:9404::/64 | |
2a01:111:f402:9405::/64 | |
2a01:111:f402:9406::/64 | |
2a01:111:f402:9407::/64 | |
2a01:111:f406:8000::/64 | |
2a01:111:f406:8001::/64 | |
2801:80:1d0:1400::/64 |
3)添加@email.microsoftonline.com到白名單
4）禁用exchange online 的域目的爲不適用exchange online
5)在exchange online 和本地exchange track center中還是找不到所發出的邀請的郵件
6）測試使用非公司郵件，例如hotmail ，gmail 都能夠收到郵件
7)由於當前所有的測試用戶都是基於本地目錄同步到azure目錄，檢查每個測試用戶的sharepoint profile中郵件地址都是正確的。
8）開始抓瞎，進行不停得測試，其中更換若干工程師，
9）考慮到目錄同步問題，因此建立一個本地用戶，分配郵箱，但是並不同步到office 365,發現該用戶可以接收到郵件。
因此懷疑儘管沒有exchange online，但是由於域名和本地域名一致，所以依舊使用exchange online 來發送郵件，同時exchange online認爲此人爲exchange online 內部用戶，因此就發送了郵件，但是沒有任何NDR提示。
生下來就比較容易，在exchange online 建立發送連接器，使用MX 記錄尋址到我們郵件網關地址。
本地郵件服務器創建接收連接器。
測試一切正常，因此這個例子證明sharepoint online 依舊使用exchange online 來發送郵件，而不在意該域名是否被exchange online 使用，其實我個人認爲是個微軟設計上的問題。
希望遇到類似的問題，可以有所參考並有幫助。