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I have recently migrated SM 14.x from one server to another.. While so doing I have installed SM 15.x
The migration went well, with all the domains and users loading on the interface.
I have also updated the MX record, and DNS has propagted well.
Emails started flowing, then 2 hours after now no users are able to send emails. Only incomings are flowing.
The spool is increasing and so is the waiting to delivery.
I went through the Knowledge Base and tried some solutions but none seem to help?
Woulld anyone have an idea please?