Basically I would like to start blocking external email access from the internal network such as Yahoo Mail. I don't want to block access to Yahoo itself, just inbound email from Yahoo and other sites like that.
Is there any documentation on how to best accomplish this?
Thanks in advance!
You may block the Yahoo email server's domains.
Incoming Mail (POP) Server: pop.mail.yahoo.com
Outgoing Mail (SMTP) Server: smtp.mail.yahoo.com
However, it works only for direct access from the internal client to the servers. Many users use web browsers to access their emails (webmail).
Plus, there is another issue that the users may access the Yahoo emails through other email providers. (e.g., I access my Yahoo emails via Gmail - there is a feature called 'Import mail' or 'Check mail from other accounts.')
That means you have to block other service providers such as Google.
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