Microsoft Office 365 List of outgoing SMTP IP/Network addresses
The following are the outgoing IP addresses and networks of Microsft Office 365 SMTP/Email in case you need to know to white-list in your antispam or firewalls:
52.100.0.0/14
40.92.0.0/15
40.107.0.0/16
104.47.0.0/17
2a01:111:f403::/48
2a01:111:f400::/48
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