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I have several clients sending out bulk emails using our mailservers. In the last week or so we've noticed a large number of bouncebacks for Bigpond addresses.
delivery temporarily suspended: lost connection with extmail.bigpond.com
extmail.bigpond.com refused to talk to me: 421 Connection refused due to exceed max concurrent connections. IB007
While we've received these occasionally in the past for an email here and there the rate at which it has recently happened has raised concerns. Have there been changes to the amount of connections that can be made?
These mailservers are not blacklisted.
Can someone get in touch and provide some assitance?