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Old 30th July 2012, 09:54
concept21 concept21 is offline
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Question How to force postfix to use secure smtp?

Dear all ISPConfig3 Postfix users,
Since I need to send out account passwords to users by emails, hacker may intercept these credentials when listening to the tcp out port 25 of my ispconfg server.

Now my question is: how to force postfix to use secure smtp to send out email? That is to secure the path from my ispconfig3 server to my customer's email server. For instance, if he is a msn user, the picture becomes:

My ispconfig 3 Postifx server ------ smtp ------> msn mail server

Then, how do we secure the above path?

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Old 30th July 2012, 19:45
fbartels fbartels is offline
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This is not possible.

For example: How does the MSN Server know how to decrypt the secure connection? As long as you are using keys which are globally known, everyone can ready and decrypt your connections.

The only solution is to use for example pgp. The downside is, that your client needs your public key to decrypt you messages, which you shouldn't send via email ;-).
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Old 31st July 2012, 09:52
till till is offline
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I guess he meant that he just want to force tls for outgoing emails. Please take a look here ofr some instructions:

Till Brehm
Get ISPConfig support and the ISPConfig 3 manual from ispconfig.org.
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Old 31st July 2012, 11:14
concept21 concept21 is offline
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That sounds close. Thanks.
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