Here’s a great tool for testing DNS, Mail, SMTP, and similar environments to see if they are listening on certain ports across the internet.
https://www.dnswonder.com/Tools/
With it, you can test:
- GET DNS RECORDS
- GET MX RECORDS
- GET PTR RECORDS
- GET SPF RECORDS
- GET BLACKHOLE LIST (RBL)
- GET SMTP SERVER TYPE
- TEST SMTP CONNECTIVITY
- TEST EMAIL DELIVERY
- TEST EXCHANGE SERVER
- TEST IMAP SERVER
- TEST ZIMBRA SERVER
- TEST REGULAR EXPRESSION
- ENCRYPT DATA
Enjoy.
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