Hi folks,

I was wondering if someone could assist me with a bit of testing.

Apparently Microsoft route any suspicious outbound emails through a 
specific set of IP addresses so that they don't risk tarnishing the 
reputation of the main Office 365 emails. That is quite a clever idea. 
Unfortunately  am finding that emails going via the HRDP do not get 
delivered to our ASSP servers. The error that comes back in the bounce 
message is a Winsock error from their mailservers and they are telling 
me that our servers are not responding to their connection request.

I do not believe this is the case as ASSP doesn't log anything from the 
IP address concerned at all, however there is a possibility that 
additional security software might be dropping it (denyhosts, fail2ban etc).

The issue I am having is that customers forward the ASSP block report to 
me asking for something to be adjusted and I can't reply unless I remove 
the report from the reply, so I would like to ask for a couple of 
volunteers. I would like to send a copy of one of the failing emails to 
a couple of addresses on different servers that run ASSP to see if they 
all fail or if it is something specific to our configuration. If anyone 
is willing to help, please send me your email off list. I will send you 
and email requesting your reply if it comes through.

All the best,
Colin Waring.

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