Dear All,
i need some help from gurus here. we are currently hosting different kind of email service in our network ( Mdaemon, Cpanel, Exchange).
for the last 1 month, user reported not able to receive those DHL system generated email. it happens to all the email account in different platform. i have spend a lot of time looking at this but still cannot resolve. i suspect it could be something blocking from the firewall side.
Anyone have encounter this before?
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