I've been having some on/off smtp issues and opened some tests over the weekend. Emails can show as sent but are not received by the parties. Some include gmail/yahoo.

 

- Some subnets are blacklisted. This led me to check further on reverses and possibly a root cause :

 

Hostname:	g-3-3-0-core-as12455.telkom.co.ke
ISP:	Kenyan Post & Telecommunications Company
Organization:	Nazarene University
Proxy:	None detected

 

- Further checks on dnsbl revealed at least 4 problems.

 

Is this Uni responsible for spam and blacklisting?

 

Orange kenya need to isolate this problem asap.