How To Change SMTP Port In Eudora

This weekend I helped out a friend who was using Eudora 6.0 on Mac OSX (Snow Leopard) who had to change the ports for her outbound SMTP connections.  I didn’t find any help on the internet – I ended up taking a guess, and it worked out – so here’s how to do this!

In the Settings panel, where you fill in the name of your outbound SMTP server, append the name of the server with a colon and the port you need to use.  For example, she was using and had to change it to use port 587 outbound.  I changed the SMTP mail server entry to read:


Make sure there are no spaces to either the left or the right of the colon. 

When I went looking for information to help her, I found that for earlier versions of Eudora (like Eudora 6.0 as she was using), most sources recommend that you install the Esoteric plugin. This plugin is not enabled by default, but shipped with most early versions of Eudora. Once you have activated the Esoteric plugin, you can either edit the SMTP port in the Settings panel, or you can edit the Esoteric application files directly.

Either way, I think you will agree that it is a lot easier to just append the port number to the mail server!

It’s common for internet service providers (ISPs) to change the port you have to use for SMTP. This is an attempt (mostly futile) to stop the ocean of spam that gets relayed through their services.

If you are using an external mail server – in other words, if your email is through a company other than your ISP – then your mail program connects to that service through a port. All email programs use the default mail ports by default – port 110 for POP (incoming) and port 25 for SMTP (outgoing). Unfortunately, so do programs which hijack your computer and start sending spam on their own.

By blocking traffic on port 25 (the SMTP port), ISPs hope to block all of the spam email being sent by those parasite programs. Unfortunately this usually ends up causing more problem for their customers than it does for spammers.

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