As as SysAdmin i need to check email issues very frequently, folllowing best websites which helps me:
- http://ismyemailworking.com/AdvancedTest/ - This site will show you how your email process from finding the MX records to reaching the recipient email ID.
- http://www.dnsexit.com/Direct.sv?cmd=testMailServer - This tool will telnet to your email server at the specified SMTP port and try to deliver the message to your email server. It will detect weather your email server is configured correctly and give you hints of possible configuration error on the email server.
- http://domino-118a.maysoft.com/selfservespam2.nsf/dl - Sometime you need to check if your email server able to detect spam email. On this site, you can request to send you a few samples of known 'spam' for use in testing the operation of our anti-spam products.
- http://www.emailsecuritycheck.net/index.html - One of the best site,which try to test your Anti-Spam or Email filtering system.There are seven test mails are being sent:
- The first mail (1/7) contains a harmless executable attachment. Even though it is harmless, it should be removed (or replaced) by your attachment blocker. Depending on the configuration of your attachment blocker, this mail may never reach you.
- The next mail (2/7) contains a harmless executable attachment, the EICAR anti virus test file in a
.zip archive. This file should be detected by every virus checker. Depending on the configuration of your virus checker, this mail may never reach you. - The third mail (3/7) is harmless spam message (GTUBE spam signature), and should be detected by every spam filter. Depending on the configuration of your spam filter, this mail may never reach you.
- The remaining four mails (4/7 to 7/7) contain attachments disguised in different ways. Even though the attachments are harmless, they should be removed (or replaced) by your attachment blocker. Depending on the configuration of your attachment blocker, these mails may never reach you.
- https://rtcamp.com/tutorials/mail/server/testing/spam/ -Official Spamassasin test mail site