In relation to the recent IP blocking incident in Russia, new IP addresses are assigned to different Hosted Email Security (HES) MTAs in addition to the already active IP addresses.
The new IPs are currently outside of the blocked ranges to ensure continuous service availability for the whole European region.
The additional IP addresses are as follows:
HES customers with air-tight security configuration restricting their mail servers or MTAs to do OUTBOUND connections only to the previously assigned IP range for relay.hes.trendmicro.eu may experience OUTGOING email delays or delivery failures when their MTAs try to connect to the new IP addresses.
To avoid this, customers with such environment are advised to add the 2 new IP addresses in their firewall rules and allow their mails servers/MTA’s to connect to the additional IPs.
INBOUND/INCOMING traffic will have no impact.