Occasionally you may want to test your mail server to see if it accepts unauthenticated mail to be relayed.
These URLs allow you to do this:
http://www.abuse.net/relay.html
http://www.dnsgoodies.com/
http://www.checkor.com/
Entries Tagged as 'SMTP'
Test for open relays
January 14th, 2009 · No Comments
Testing SMTPS
January 12th, 2009 · No Comments
To quickly check that SMTPS is running on a remote server you could run:
openssl s_client -connect hostname:465
Testing SMTP AUTH
January 21st, 2008 · No Comments
Great link to information regarding testing SMTP AUTH:
http://qmail.jms1.net/test-auth.shtml
To test SMTP AUTH I did the following:
[server]# perl -MMIME::Base64 -e ‘print encode_base64(“\000test\@domain.com\000testpassword”)’
AHRlc3RAZG9tYWluLmNvbQB0ZXN0cGFzc3dvcmQ=
[server]# perl -MMIME::Base64 -e ‘print decode_base64(“AHRlc3RAZG9tYWluLmNvbQB0ZXN0cGFzc3dvcmQ=”)’
test@domain.comtestpassword
Then connect to the server and try putting in the above SMTP AUTH details:
[server]# telnet localhost 25
Trying 127.0.0.1…
Connected to localhost (127.0.0.1).
Escape character is ‘^]’.
220 localhost ESMTP
ehlo testing
250-localhost
250-STARTTLS
250-PIPELINING
250 8BITMIME
AUTH PLAIN AHRlc3RAZG9tYWluLmNvbQB0ZXN0cGFzc3dvcmQ=
235 go [...]