Kapil Hari Paranjape wrote:
Any IP port is like any other so the choice of port 23 instead of
port 25 will not make mail any more or less safe. Safety will be
determined largely by the SMTP daemon you run and how well you
configure it.
Actually, it's fairly common to remap popular port numbers to higher
ones to avoid brute-force attacks. Though this step in itself won't make
a server secure, it definitely helps.
Vamsee.
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