Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
<REDACTED@REDACTED.com>: host mail.REDACTED.com[188.8.131.52] said: 550 Access denied - Invalid HELO name (See RFC2821 184.108.40.206) (in reply to MAIL FROM command)
<SOMEONE@kcaccess.com>: host mail.kconlineinc.com[220.127.116.11] said: 554 5.7.1 Confused? 05 (in reply to MAIL FROM command)
Join the community of 500,000 technology professionals and ask your questions.