Tag: smarthost

Open Relays and Mail Sinks

Email is a “store and forward” protocol. The sender doesn’t connect directly to the recipient to send the mail with just one network hop, rather the sender connects to a mailserver (usually referred to as an “MTA”, short for Mail Transfer Agent) and sends the message there. Once that MTA has received the message it […]

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I need IP addresses to handle the volume

Number two of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need lots of IP addresses so my MTAs can handle the volume of mail sent Why this is right One IP address per outbound smarthost is a sensible minimum. It is […]


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