大家若對自己的或他人的mail server使用上擔心的話，可以用下述網站提供的功能測試一下:
http://www.mailradar.com/openrelay/
本虛擬主機測試如下:
<<< 220 mail.netpc.com.tw ESMTP MailEnable Service, Version: 1.986-- ready at 08/08/13 11:06:15
>>> HELO mailradar.com
<<< 250 Requested mail action okay, completed
>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>> RCPT TO: relaytest@mailradar.com
<<< 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.
>>> QUIT
<<< 221 Service closing transmission channel
...
...(共18項方式測試，不一一列了)
...
[Method 18]
<<< 220 mail.netpc.com.tw ESMTP MailEnable Service, Version: 1.986-- ready at 08/08/13 11:07:20
>>> HELO mailradar.com
<<< 250 Requested mail action okay, completed
>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>> RCPT TO:
<<< 550 Requested action not taken: mailbox unavailable or not local
>>> QUIT
<<< 221 Service closing transmission channel
[TEST PASSED]
All tested completed! No relays accepted by remote host!
所有的18項測試都通過，顯示不可能被外部使用relay方式當跳板!!
若還想試試別家的話:
http://spam.gsnmm.gov.tw/cgi- bin/relayall.cgi
http://www.spamhelp.org/ shopenrelay/shopenrelaytest. php
http://www.abuse.net/relay. html
http://www.checkor.com/
http://www.mailradar.com/openrelay/
本虛擬主機測試如下:
Port 25 is Open at 122.116.207.186
[Method 0]
<<< 220 mail.netpc.com.tw ESMTP MailEnable Service, Version: 1.986-- ready at 08/08/13 11:06:12
>>> HELO mailradar.com
<<< 250 Requested mail action okay, completed
>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>> RCPT TO:
<<< 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.
>>> QUIT
<<< 221 Service closing transmission channel
=============================================================
[Method 1]<<< 220 mail.netpc.com.tw ESMTP MailEnable Service, Version: 1.986-- ready at 08/08/13 11:06:12
>>> HELO mailradar.com
<<< 250 Requested mail action okay, completed
>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>> RCPT TO:
<<< 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.
>>> QUIT
<<< 221 Service closing transmission channel
=============================================================
<<< 220 mail.netpc.com.tw ESMTP MailEnable Service, Version: 1.986-- ready at 08/08/13 11:06:15
>>> HELO mailradar.com
<<< 250 Requested mail action okay, completed
>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>> RCPT TO: relaytest@mailradar.com
<<< 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.
>>> QUIT
<<< 221 Service closing transmission channel
...
...(共18項方式測試，不一一列了)
...
[Method 18]
<<< 220 mail.netpc.com.tw ESMTP MailEnable Service, Version: 1.986-- ready at 08/08/13 11:07:20
>>> HELO mailradar.com
<<< 250 Requested mail action okay, completed
>>> MAIL FROM:
<<< 250 Requested mail action okay, completed
>>> RCPT TO:
<<< 550 Requested action not taken: mailbox unavailable or not local
>>> QUIT
<<< 221 Service closing transmission channel
[TEST PASSED]
All tested completed! No relays accepted by remote host!
所有的18項測試都通過，顯示不可能被外部使用relay方式當跳板!!
若還想試試別家的話:
http://spam.gsnmm.gov.tw/cgi- bin/relayall.cgi
http://www.spamhelp.org/ shopenrelay/shopenrelaytest. php
http://www.abuse.net/relay. html
http://www.checkor.com/
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