Email throttling — limiting messages from being sent

Reasons for rejected connections

An SMTP dialogue

<<< <wait for connection on TCP port 25>>>> <open connection to server><<< 220 SMTP service ready>>> EHLO<<<>>> MAIL FROM:<><<< 250 sender <> OK>>> RCPT TO:<><<< 250 recipient <> OK>>> DATA<<< 354 enter mail, end with line containing only “.”>>> .<<< 250 message sent>>> QUIT<<< 221 goodbye

Sender reputation

Domains using the same mail server

Automatically reacting to error codes

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