No, there is no feature to blacklist any source. However, we remove IP's from the SPF record and we shift the DMARC record to the reject policy to make sure that the spoofed emails do not land in the receiver's inbox.
We have a feature of Four Eye Validation, which makes sure that if anyone other than the admin wants to take an action then, the person has to request permission from the admin.
Even if you don't send any marketing emails, hackers can misuse your email domain to send spoofed emails to your employees, partners and vendors. This tool can help you prevent such incidents.
Transport Layer Security (TLS) is a protocol that secures your emails by encrypting the connection from the sender to the recipient (client to server). Encryption makes snooping of your emails much harder as they travel to their recipients. ...