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 example.com SMTP service ready>>> EHLO somecompany.com<<< 250-example.com>>> MAIL FROM:<sender@somecompany.com><<< 250 sender <sender@somecompany.com> OK>>> RCPT TO:<jon@example.com><<< 250 recipient <jon@example.com> 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

I write about my interests as a creative developer — vandiessen.com

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