(delivery temporarily suspended: lost connection with while receiving the initial server greeting)

[bennhana]

Hi all

A client server has started getting this error message below. It has been working fine, it just started yesterday.

(delivery temporarily suspended: lost connection with while receiving the initial server greeting)

It's also showing double-bounce messages. I have googled, tried some of the solutions I was finding, but none is working.

Please help as emails are not flowing.