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Old 05-10-2009, 10:09 AM   #1
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Postfix: any way to prevent spam with mynetworks open?

Hello and Happy mother's day.

I rent an ubuntu VPS, hosted out in CA somewhere. I want to use this computer as the mail server for my domain (postfix: SMTP and courier: IMAP). It is tricky because this computer is NOT at the 'top' of my network.

Issues arise with the 'mynetworks' parameter of the postfix configuration.

The mail system works fine, however I believe I am exposed to spammers. In order for the mail server to act as a relay server from my mobile clients (my cell phone), I needed to open up the mynetworks parameter to:

mynetworks =

Unfortunatley, the other mobile clients do NOT have static IPs, so I cannot append their address to this parameter.

I understand that this is highly insecure. I am wondering what other appraoches I can take to opening up relay access to my mobile clients.

Will an implementation of SASL 'lockdown' SMTP?

Thank you in advance.
Old 05-10-2009, 10:21 AM   #2
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Will an implementation of SASL 'lockdown' SMTP?
yes. can your cell phone handle authentication?

I am wondering what other appraoches I can take to opening up relay access to my mobile clients.
web mail?

Last edited by Berhanie; 05-10-2009 at 10:25 AM.
Old 05-11-2009, 11:52 AM   #3
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Thank you for the replies, I will look into a SASL authentication.


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