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I've a virtual server not a ksm but with lighttpd and mysql and postfix. Can I use it to replace my existing free webmail and what is a good software? I also want to use pgp if it's possible?

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What are your other requirements besides GPG support? There's tons of webmail applications available. – gertvdijk Dec 25 '12 at 12:06
    
I'm new to gpg support and I wonder how it would work in a hybrid environement? I don't know much people using GPG and I wonder why the free webmailer doesn't support it because it's already 2013? – Betterdev Dec 25 '12 at 12:18

Rainloop, hands down. Website here. Screenshot below.

enter image description here

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This is commercial software for which the standard version is not free, nor open source. – Anthon Apr 9 at 10:56
    
@anthon this software is released under the GNU affero GPL and is free for non commercial use. I believe that makes it qualify on both fronts. – terdon Apr 9 at 16:40

Horde's IMP features GPG/PGP encryption as well as S/MIME support. It's rather a somewhat more complex framework (in which IMP is just one application), but in my opinion, it has a fairly high quality standard and good user experience compared to most other open source webmail software.

Screenshot:

Horde Portal Screen

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Squirrelmail has everything you're asking for.

squirrelmail screenshot

Has good plugin support for pgp as well.

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