telnet command to test mail server connectivity
telnet mailaws.swiretest.com 25 helo mailaws.swiretest.com mail from: < [email protected] > #发件账户rcpt to: < [email protected] > #收件账户data
Must be entered right the first time, no chance of fallback
Each line entered should prompt
200 OK
Indicates that the network connectivity between the server and the mail server is OK
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