We frequently encounter questions such as, “Which port should I use?” or “Why the sudden need to switch ports when everything worked perfectly yesterday?” Admittedly, these questions aren’t straightforward to address. Why, you ask? Surprisingly, it’s not solely within the control of an external SMTP provider. Factors such as your Internet Service Provider (ISP), firewalls, and email client/software also play significant roles. Let’s delve into the world of ports – their commonality and the primary purposes they serve.
About the author
Teresa Smith
Teresa has been at SMTP2GO since 2017, currently as Customer Success Engineer. She started on the support desk, where she spent years on the deliverability frontline: SPF and DKIM misalignments, TLS handshake failures on legacy MFCs, IP throttling on Gmail, the standard list. She holds an MBA in International Business and writes regularly on the SMTP2GO blog about the issues that show up in support tickets so often they've stopped feeling like edge cases.
