User`s guide

Chapter 3 Server configuration
12
Setting an alias for undeliverable email
Aliases can be defined in the Accounts → Aliases section.
1. Click on Add.
2. This opens a dialog where a new alias can be added. In the Alias entry, enter the
*
symbol.
In the E-mail address textfield specify the address of the mailbox where any undeliverable
email will be sent (in our case it is [e-mail]).
3. Once the alias is saved, you can test it by the Check address button available in the Aliases
section.
The alias for undeliverable mail (or star alias) is used when the part of the e-mail address
before @ sign is not found among domain’s user names and aliases.
3.4 Setting connection to the Internet and to the SMTP server
Anyone can connect to the SMTP server to send messages to local domains. Sending of
messages to other domains will be restricted to local users only. Users connected from the
Internet will be prompted to authenticate on the SMTP server by username and password. This
setting can be done on the Relay Control under Configuration → SMTP server:
1. On the tab, enable the Allow relay only for option.
Warning:It is strongly recommended not to switch the SMTP server to the Open Relay
mode if Kerio Connect is available from the Internet (i.e. it uses a public IP address and
port 25 is not blocked by a firewall). If you set the Open Relay mode, Kerio Connect will
very probably be abused by spammers to distribute spam mail which will overload your
internet line. This might also cause that your server will be included in blacklists of SMTP
servers.
2. Check option Users from IP address groups and select the Local Clients group which
includes all private ranges of IP addresses.
3. Enable option Users authenticated through SMTP for outgoing mail to allow users
connected from the Internet send email.
Note: Authentication against the SMTP server must be set in the email client. Settings of
some popular clients are focused in chapter 4.2).
Now go to Security Options to set security restrictions for the SMTP server:
1. Set the Maximum number of messages from one IP address per hour option to 100
messages.
2. Set 20 in option Maximum number of concurrent connections to the SMTP server from one
IP address.