error “soft failed sender ID check. Please ensure this IP is authorized to send"

[25DORIS]

Hi!
Can you explain the reason for email error “soft failed sender ID check. Please ensure this IP is authorized to send".

[Carol.P]

This error usually occur due to 2 reasons:
1).Either hotmail blocking the Ip
2).The receiver has blacklisted the senders IP.
In such case you can first check if the ip is blacklisted in cPanel >> Mails >> Email authentication >> Additional Ip blocks for your domains (IP4):
So if the Ip is listed there it will show this error.