Changing Ports Used by Eudora
You can change the ports used by Eudora for outgoing or
incoming email from the standard
which are 25 and 110, respectively. To do so, close Eudora then move the
up one directory to
, presuming that you installed
\Program Files\Eudora Pro
. Then take the following
- Click on Tools.
- Scroll down to Ports.
- You can then put in a port number, e.g. 587 in the SMTP field, so
that Eudora would connect to port 587 on the SMTP server rather than the
default port of 25.
- Click on the OK button.
Note: tested with Eudora 4.2.2
Esoteric.epi / Esoteric Settings (Windows)
Changing Ports for Sending/Receiving (Win)
Eudora and SMTP AUTH
Many email servers require senders to authenticate with the server by some
mechanism, such as by providing a userid and password, when attempting to
send email through the email server that is not destined for an email address
residing on the server itself.
If you are attempting to send an email message using Eudora and you see a
message similar to the one below, then the
SMTP server that Eudora has been
configured to use for outgoing email likely requires authentication.
Can't send to 'email@example.com'. The server gives this reason: '550 5.7.1
<firstname.lastname@example.org>... Relaying denied. Proper authentication required.'.
Version 4.2.2 of Eudora supports
authentication when sending email. If you have a Windows 4.x version of Eudora,
you can upgrade it to version 4.2.2 by downloading
ep4xto422.exe from the
updater422 folder on the Qualcomm
FTP site. Version 4.2.0
doesn't support authenticating when sending email, though the help files
indicate that it does, according to
Eudora Pro 4.x - SMTP Auth
. If you don't know which version of Eudora you are running, you can
click on Help and then About in Eudora. You should see
"Version 4.2.2" for that version.
To enable authentication when sending in Eudora 4.2.2, you must edit
eudora.ini file. Close Eudora, if it is open, and add the
following two lines below the
[Settings] line in
Then, when you reopen Eudora, SMTP authorization should be enabled.
Note: there are different methods of authenticating with an email server.
If you see a message similar to the following, the email server does not
support the authentication method used by Eudora.
<Dominant>, Connecting to the Mail Server..., [05:24:13 PM]
Can't find a supported authentication mechanism for sending messages, and you've
specified to require authentication.
For instance, Eudora 4.2.2 doesn't support the Plain and
You can determine which authentication methods a server supports by using
telnet to connect to port 25 on the server, which is the standard SMTP port.
After you issue an
EHLO command and
some name for the system from which you are connecting, e.g. "laptop" or
"mysystem.example.com", you should
AUTH listed as one of the commands the server understands with
the authentication methods it supports listed immediately after
on the same line.
telnet 127.0.0.1 25
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 example.com ESMTP Sendmail 8.13.8/8.13.8; Sun, 11 May 2008 17:28:54 -0400
250-example.com Hello localhost.localdomain [127.0.0.1], pleased to meet you
250-AUTH LOGIN PLAIN
In the example above, the email server only supports the LOGIN
and PLAIN methods, which resulted in Eudora complaining that it
"Can't find a supported authentication mechanism for sending messages, and
you've specified to require authentication."
According to Negotiating an
SMTP AUTH Authentication Mechanism, "The standard Eudora client
(downloadable from www.eudora.com) tries to
use CRAM-MD5 by default."
If an email server supports CRAM-MD5 and DIGEST-MD5,
you would see the following, if you connected to port 25 on the server,
after you issued an
250-AUTH DIGEST-MD5 CRAM-MD5
Eudora Pro 4.x - SMTP Auth
Negotiating an SMTP AUTH Authentication Mechanism
By Weldon Whipple