Some of the questions we get asked one regular basis are, “What port should I use?” or “Why should I switch my port, everything was working fine yesterday?”. Well, let us tell you, they are not easy questions to answer, but why? Believe it or not, it’s not something an external SMTP provider has control over! It also depends on your Internet Service Provider (ISP), firewalls, and email client/software. So, let’s talk about ports, which are the most common, and what is a particular port most commonly used for? 👇