Updated public IP addresses for outgoing connections

What changed

As previously announced in December, to remove a single point of failure between availability zones we’ve added an additional IP address for JEMHC outbound connections.

Impact

Most customers who don’t have custom firewall configurations will not be impacted. If you have firewall rules to restrict connections from the historic 54.210.55.45 address, then mail connections (inbound and outbound) may start failing, causing handlers /connections to go offline seemingly randomly. You will need to update your firewall settings to allow the new secondary 54.210.87.155 address.

JEMHC outgoing IP addresses