This may happen, for example, when a sales Sometimes a legitimate message is rejected. if supported by remote SMTP server option. On the SMTP Delivery tab, select the Use SSL Secure Sockets Layer - A protocol that ensures integral and secure communication between networks./ TLS Transport Layer Security - A follower of the SSL protocol and ensures secure communication between networks.To block messages with large attachments that can overload your server, enable Limit maximum incoming SMTP message size to.number of failed commands in a SMTP session option protects against these applications by closing the SMTP connection automatically after Spammers often send messages using applications that connect to SMTP servers and ignore itsĮrror reports.To block spam messages sent to a large number of recipients, enable Max.To block incorrectly configured DNS entries, enable Block messages if client's IP address has no reverse DNS entry (PTR).To block senders with fictional email addresses, enable Block if sender's domain was not found in DNS Domain Name System - Enables the translation of hostnames to IP addresses and provides other domain related information.Enable the Do not apply these limits to IP address group option and select a group of trusted IP addresses that are not affected by.The dictionary to generate possible usernames. Harvest attacks, in which an application connects to your server and uses number of unknown recipients protects Kerio Connect from number of concurrent SMTP connections gives protection fromĭenial of Service ( DoS Denial of Service - An attack that can overload the server and makes it unavailable to users.), attacks Sent from the same IP address after reaching the set limit. number of messages per hour discards any new message you can set the following IP address based limits: For a single IP address An identifier assigned to devices connected to a TCP/IP network.In the administration interface, go to the Configuration > SMTP Server > the Security Options tab section.
In Kerio Connect, you can configure several limits for IP addresses to secure your SMTP server: For detailed information about configuring the SMTP server, read Configuring the SMTP server.
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