Need to change Exchange online Recipient Limits. The default value is 500 and can't be modified.
In this case, users are able to send bulk\Spam messages by selecting entire global address list.1,547 votes
See the public announcement here:
You should also be aware that we improved Outbound Spam Policies to grant additional flexibility:
Forwarding in SMTP is fundamentally flawed unless you implement SRS.
If you maintain the Return-Path of the originating message while forwarding you effectively spoof the originating domain.
If you modify the Return-Path to be the address of the account that forwarded a message you break the Return-Path chain and delivery issues will result in the forwarded message Delivery Status Notification (DSN) being delivered to the forwarding user and not the original sender.
SRS resolves this by modifying the Return-Path in a way that doesn't spoof the originating domain but still allows DSNs to be sent to the original sender.647 votes
SRS support has now been rolled out to the entire Office 365 service.
Recently one of my user's credential compromised and using his credential and intruder sent email containing a malicious link. The email directly delivered to other person as it was treated as internal email.
ATP by design doesn't apply safe link policy to internal emails. So I can clearly say it is a high security risk.
Internal user can also do it by intention or by unknowingly, which will in return damage the environment instead of having ATP in place.
So my suggestion is to apply the safe link policy to internal as well as external emails.
Manoj Malik147 votes
The ability to apply SafeLinks policies to intra-organizational mail is rolling out currently. Thank you for the feedback!
Please implement in ATP Safe Link a black list for single tenant where insert the bad urls that ATP not intercepts or the bad url that are malicious for the company47 votes
We resolved this in 2017. Additionally, today, you can now check and report links to us in Submissions Explorer (Security & Compliance → Threat Management → Submissions)
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