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16.4 Relay SMTP server
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Warning:
1. If SMTP is specified by a DNS name, it cannot be used until WinRoute resolves a cor-
responding 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 6.