Email Outgoing blocked, Unusual Spamming by unknown senders

Email Outgoing blocked, Unusual Spamming by unknown senders

Hi,
Dear Support team member,

we are facing the following problems

1. One of our users had been automatically marked as spam, and his outgoing emails are completely blocked. Even I cannot change this status from mail admin panel. Please help in this regard




2. We are receiving spam emails as below in inbox from unknow senders - Screenshot is pasted below.
2a Inbox displays email sender same as display name of our company email addresses.
2b. Email sender address is not our company email
2c. This email is being sent directly our personalized

email addresses, and group email addresses.

In this situation, we are receiving emails from different email senders.

Kindly help us to resolve all three issues.

Yours
Thankful

Shujaat