>>> (-) Server Settings
>> ...
>>> Header Encryption Key
>>
>> Encryption key allows to hide SquirrelMail Received: headers
>> in outbound messages. Interface uses encryption key to encode
>> username, remote address and proxied address, then stores encoded
>> information in X-Squirrel-* headers.
>>
>> Warning: used encryption function is not bulletproof. When used
>> with static encryption keys, it provides only minimal security
>> measures and information can be decoded quickly.
>>
>> Encoded information can be decoded with decrypt_headers.php script
>> from SquirrelMail contrib/ directory.
>
> Sorry, that is greek to me. ;) What is it that you suggest that I enter
> there, and will it help this situation?

Any password string will work.

if encryption string is not set, SquirrelMail adds
---
Received: from xxx.xxx.xxx.xxx
  (SquirrelMail authenticated user some-username)
  by webserver-address with HTTP;
---

If encryption string is set, SquirrelMail adds
---
X-Squirrel-UserHash: FRwJBxQoFRwUCQsBEl0IEg==
X-Squirrel-FromHash: VEtTUFZQUEE=
---
or something similar.

First header looks like standard email header and can be parsed by email
scanners. Second header is custom. Why should scanners care about it.

-- 
Tomas


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