smtp port

  • Be sure to checkout “Tips & Tricks”
    Dear Guest Visitor → Once you register and log-in:

    This forum does not automatically send notices of new content. So if, for example, you would like to be notified by mail when Steve posts an update to his blog (or of any other specific activity anywhere else), you need to tell the system what to “Watch” for you. Please checkout the “Tips & Tricks” page for details about that... and other tips!

  • Larger Font Styles

    Just a quick heads-up that I've implemented larger font variants of our forum's light and dark page styles. You can select the style of your choice by scrolling to the footer of any page here. This might be more comfortable (it is for me) for those with high-resolution displays where the standard fonts, while permitting a lot of text to fit on the screen, might be uncomfortably small.

    (You can permanently dismiss this notification with the “X” at the upper right.)


a viewer

Sep 30, 2020
Just found something interesting today. The SMTP port does more than send the emails, it allows you to chose which protocol you want to use. Used to be some ports were blocked by some ISPs. Port 465 establishes an SSL connection, while 587 does it through TLS (at least with the servers I tried, including gmail). Always thought it was just for convenience or some other historical reason, that we had some extra ports. I know the use of 465 is shun upon, but too many people are still using it. So not sure it will be discontinued soon.

Is there an advantage to using one over the other? Don't know if email programs would disable the obsolete tls versions, or that it would require strong ssl.


Well-known member
Sep 18, 2020
Rutland UK
Port 465 was originally defined for SMTP over SSL, but has since been reallocated. The one that you should use is 587. That is the port that should be used to send mail from a client, e.g. Outlook or Thunderbird, to a server. Port 25 is meant to be for server to server traffic which is why some ISP's block it.