Kerio Tech Firewall6 - Manual (Page 239)

18.3 Relay SMTP server
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be used for reference in recipient’s mail client or for email classification. This is why it is
always recommended to specify sender’s email address in WinRoute.
Connection test
Click Test to test functionality of sending of email via the specified SMTP server. WinRoute
sends a testing email message to the specified email address.
Warning
1. If SMTP is specified by a DNS name, it cannot be used until WinRoute resolves a corre-
sponding IP address (by a DNS query). The IP address of specified SMTP server cannot be
resolved warning message is displayed in the SMTP Relay tab until the IP address is not
found. If the warning is still displayed, this implies that an invalid (non-existent) DNS
name is specified or the DNS server does not respond.
If the warning on the SMTP server tab is still displayed, it means that an invalid DNS
name was specified or that an error occured in the communication (DNS server is not
responding). Therefore, we recommend you to specify SMTP server by an IP address if
possible.
2. Communication with the SMTP server must not be blocked by any rule, otherwise the
Connection to SMTP server is blocked by traffic rules error is reported upon clicking the
Apply button.
For detailed information about traffic rules, refer to chapter 7 .