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Frequently Asked Questions

Which SMTP port should I use?

Ports 25, 465, 587, or 2525 for SMTP have all been considered standard SMTP ports at some point, but only 587 or 2525 really should be considered for modern use. If you’re configuring your systems to use SparkPost as an SMTP relay, you should use port 587 as your standard SMTP port, with 2525 as an alternate in case port 587 is not available.

What is a SMTP relay and how does it work?

The Simple Mail Transfer Protocol (SMTP) relay is a type of email delivery service that relays messages from a sender's server to a receiver's server. It works in a way similar to a post office service. Think of SMTP servers as post offices. You have your own server or post office to deposit your email campaigns.

What is a SMTP server?

SMTP stands for Simple Mail Transfer Protocol, and it’s an application used by mail servers to send, receive, and/or relay outgoing mail between email senders and receivers.


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