Use it only to deliver mail to local domains. Therefore much higher than the number of messages sent by external users (servers) that These users send all their outgoing mail through Kerio Connect - the count of messages sent by these users to this server is This rule is often usedįor groups of local users (see the Relay Control tab). Group of IP addresses on which the limitations will not be applied. Unknown recipient is blocked for an hour.ĭo not apply these limits to IP address group If this type of protection is enabled, the server sending messages to an Guesses common usernames of recipients’ fails up to the number of allowed unknown This is a method of protection against DoS attacks (Denial of Service - too manyĬoncurrent connections overload the system and no other users can connect to theĪlso known as a Directory harvest attack, this condition is met when an application that Maximum number of concurrent TCP connections to the SMTP server from one IP address. Where the limit was exceeded in the recent our is discarded. If this option is enabled, any new message sent from the IP address Note: Maximum count of messages received from a single IP address is checked alwaysįor the last hour. The disk memory from overload by too many messages (often identical and undesirable). Maximum count of messages that can be sent from one IP address per hour. These options can be set in the Security Options section.įigure 12.2 Security Options - IP address based limits Your server will be included in databases of spammer SMTP servers (see below).Īpart from completely blocking certain senders Kerio Connect provides options that limit, forĮxample, sending too many messages or opening too many connections (known asDoS attack. This could overload your Internet connection. Port 25 not behind the firewall, it is highly probable that it will be misused to send If Kerio Connect is available from the Internet and uses a public IP address with it uses a public IP address and port 25 is not blocked by afirewall). We recommend you not to use this mode if Kerio Connect is available from the User can send email messages to any domain. In this mode, the SMTP server does not check users who use it to send email. Users must meet at least one of these conditions. minutes after successful POP3 login field.Īuthentication by IP addresses is independent from authentication by usernames therefore Users authenticated through POP3 (username and password) will be granted relay accessįrom their IP address for a period of time given in the Allow SMTP relay for. Users authenticated through POP3 from the same IP address Thus, all users that have their own accounts in
#Kerio connect smtp password#
Users authenticated through SMTP server using a valid username and password will beĪllowed to send email to any domain. Users authenticated through SMTP server for outgoing mail Group or to create a new one (see chapter19.1). Use the IP address group menu to choose an item from the list of groups defined in Configuration → Definition → IP Address Groups. Use this option to define a group of IP addresses from which email can be sent to anyĭomain. However, this filter can be enabled by a special option in the Spam Filter section on the Spam Rating tab if necessary (for more information, refer Trusted servers will not beĮven checked by SpamAssassin. The SPF and Caller ID modules (for details, see chapter13.5). Generally, authenticated senders can use email messages to anyĭomain via this server, whereas unauthorized users can send messages only to localĪlso add all trustworthy servers to this IP group. Use this option to activate user authentication by IP addresses or usernames and Use the Relay control tab to set groups of allowed IP addresses and/or user authentication In this section, the delivery parameters can be also set: However, only authorized users will be allowed to send email to Anyone can connect to the SMTP server to send Kerio Connect provides a protection system that enables users to define who will be allowed Sender and your server can be added to a database of spam servers.
Thus your company might be considered a spam Receiving messages sent from this server. Recipients of suchĮmail messages will see your SMTP server as the sender in the source text and might block Thus the server can be misused to send spam messages. To it and the port 25 is available for access), any client can connect and use the server to sendĪn email message. The SMTP server is available from the Internet (anytime when at least one MX record is directed This way, the server is protected from being misused. Protection of the SMTP server enables users to define who will be allowed to use this serverĪnd what actions he/she can perform. SMTP server settings protect the server on which Kerio Connect is running from misuse.
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