Update prerequisite-system.md
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@ -44,9 +44,9 @@ We can help to correctly plan your setup as part of our support.
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Please check if any of mailcow's standard ports are open and not in use by other applications:
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Please check if any of mailcow's standard ports are open and not in use by other applications:
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```
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```
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ss -tlpn | grep -E -w '25|80|110|143|443|465|587|993|995|4190|5222|5269'
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ss -tlpn | grep -E -w '25|80|110|143|443|465|587|993|995|4190|5222|5269|5443'
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# or:
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# or:
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netstat -tulpn | grep -E -w '25|80|110|143|443|465|587|993|995|4190|5222|5269'
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netstat -tulpn | grep -E -w '25|80|110|143|443|465|587|993|995|4190|5222|5269|5443'
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```
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```
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!!! warning
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!!! warning
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