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The Server Tab allows you
to control the way Top Dog acts when receiving SMTP connections.
Most users should
never need to concern themselves with, or change the settings on this
tab.
The SMTP server tab controls
the SMTP service that Top Dog provides.
SMTP is the language that is used to send messages.
Your email reading program
connects to Top Dog to send messages.
The settings on this tab determine who can connect to Top Dog to send
messages as well as the port and maximum message size that Top Dog will
accept.
Allow connections to Top Dog
SMTP service by this machine only.
If this option is checked you
Top Dog will ignore any connection attempts from any machine but the one
it is running on.
This is a good security feature.
Unless you have Top Dog running on a different machine than your email
client you should leave this checked.
Allow any LocalHost connection
to this service regardless of userid or password.
This option is recommended
since you can safely assume that connections from the same machine that
Top Dog is running on are legitimate.
Limit
incoming messages to X Kilobytes.
It is a good idea to set some
reasonable maximum size of email that you will accept to be sent through
Top Dog.
If no upper limit is set then Top Dog could theoretically keep accepting
lines of an email until all the memory in your computer is consumed.
This is not usually a problem if you have the "Allow connections
to Top Dog SMTP service by this machine only." option set. Otherwise,
some outside computer could attempt to send massive mail through you or
crash your computer.
Accept mail for the following domains
(wildcards permitted).
If you enter the name of one
or more domains here Top Dog will route mail sent through it's SMTP server
locally.
This is not normally a useful feature unless you have Top Dog running
outside a firewall. In this case it is possible to have Top Dog accept
mail for you from another computer. i.e. Act like a normal SMTP server.
Only accept mail for for valid
users.
If you have the Accept mail
for the following domains option set then you have the further option
of accepting mail for all names at that domain or just for valid users.
Valid users, in this context are names that appear in the POP
Accounts tab.
If this option is checked and someone tries to send an email to a name
that doesn't exist the relay will be rejected.
Otherwise the mail will be picked up the next time someone logs into the
POP Server with the recipient's name.
Mail for invalid users can be picked up only
by someone logging in directly (non-intercepted) to the POP server.
Active.
Check this box to activate
the SMTP server. This is necessary in order for your email client to get
mail.
The only reason you should normally deactivate the SMTP server is to change
the options below. E.g. Port number.
You must deactivate the SMTP server to change the options below.
Auto Select Port.
If this option is selected
Top Dog will automatically scan for a port that is not currently being
used.
If you plan to connect directly to Top Dog you will want to fix the port
so that you know what port you should be connecting to.
Top Dog will complain when started if there is another program using the
port you have chosen.
Listen
to Port.
This option changes the port
that Top Dog listens on for SMTP traffic.
The usual port is 25.
It is recommended that you leave the port number set to 25 unless you
have some other SMTP service running that conflicts with this port number.
Maximum Incoming Connections.
This option sets the maximum
number of simultaneous connections that Top Dog will accept.
This should not normally be an issue.
Timeout After X Seconds.
If the Top Dog server is waiting
for a response from the client for longer than the value set here Top
Dog will drop the connection.
Normally, if you are running the client and the server on the same machine
this should not be a problem.
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