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lazarus_

join:2002-08-31
Resolute, NU

3 edits

Re: Be honest!!

Why block 25 inbound?

IhatemyISP
MM2 Corbski
Premium
join:2003-01-27
Japan

Re: Be honest!!

said by lazarus_ See Profile:
Why block 25 inbound?

To block open relay servers.

rchandra
Stargate S G-1 And Atlantis Fan
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14225-2105
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said by lazarus_ See Profile:
Why block 25 inbound?

There is no particularly good reason, honestly. About the only reason to do so is if a host is compromised, and the attacker wants a standard promiscuous relay. Relaying can nonetheless be done on a compromised host, as the method of injecting the messages need not take place over port 25.
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Shady Bimmer
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join:2001-12-03
Northport, NY
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said by lazarus_ See Profile:
Why block 25 inbound?

•It is (and has always been) a violation of the TOS
•It helps contain access to open-relays to within OOL netblocks, preventing use from outside OOL.
•Combined with forced use of OOL's mail relays for outbound SMTP helps OOL identify both Spam sources as well as those running SMTP servers as open-relays.
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