What is a SMTP port?
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Ports are endpoints that individual servers use to connect to a network and retrieve data. Think of it like an old school switchboard with a technician plugging the incoming call into a jack to connect it to a specific phone. An SMTP port is a port designed to direct email through a network to its recipient.
The most important SMTP ports are:
*Port 25
*Port 587
*Port 465
The thing is, not all SMTP ports are equal. Choosing the wrong one could have negative consequences and reflect poorly on you as a sender.