Hey everyone. I'm currently experiencing a problem when connecting to Zoho's MX servers. I have a EC2 instance on Amazon where I'm hosting a couple of Wordpress websites for my company. I have a contact form in them that automatically sends email to my email address which is hosted on Zoho.

When the server tries to connect to either mx2.zoho.com or mx.zoho.com, the connection times out. Trying to connect via telnet to port 25 on either server also times out:

If I connect to them from my laptop, it works fine. I have a feeling that my server's IP might have ended in some sort of blacklist perhaps. Can someone provide assistance on this matter? Thanks in advance.