Servers that can be accessed by clients (such as
email programs and web browsers) "listen" for clients to connect
to them on well defined port numbers.
Well known services such as webservers and email servers use well-known
port numbers. For example, when you visit a website on the internet, your
browser will try to connect to that website using port 80. Similarly, when
your email client wants to retrieve mail from your ISP's POP3 server, it
will normally connect to that server using port 110. When you send emails
out, your email client will connect to your ISP's SMTP server using port
25.
Although multiple clients can connect to a port, there can only be one server
listening for connections on a particular port.
As far as your email application is concerned, ChoiceMail behaves as a server
and normally listens to your email application on port 110 (for requests
to retrieve new email messages) and on port 25 (for forwarding outgoing
emails).
However, some anti-virus applications also set themselves up as servers
so that they can intercept email messages and examine them for vira. If
the anti-virus program runs before ChoiceMail (which is the normal and appropriate
behavior), that anti-virus program will grab ports 110 and 25 so that it
can monitor incoming and outgoing emails respectively. When ChoiceMail starts
up and choose to configure it manually, ChoiceMail will note that the ports
it needs are already in use and it will inform you through a warning message
(picture).
The best way to address this conflict is to change ChoiceMail's port settings
manually. Click on the Options menu, select Configuration and when the configuration
dialog window appears, click on the Advanced tab (picture).
In terms of the actual values, in most cases changing the POP3 port from
110 to 115 and changing the SMTP port from 25 to 30 will be sufficient.
In the extremely unlikely case that those ports are also taken, you can
just keep incrementing the values until you find available ports. Each time
you change the port values and click OK to close the dialog box, ChoiceMail
will tell you whether that port is available or whether there is still a
conflict.
Once you have configured ChoiceMail so that there are no port conflicts,
then when you are configuring your email application to connect to ChoiceMail,
you will have to ensure that you update the ports used by your email application
so that they match the new values you have set in ChoiceMail.
See also the following technotes on our website:
Port
conflicts
Configuring
MS Outlook
Changing
ports in Eudora
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