I've never really used ISPconfig however just looking at the website it looks like SquirrelMail is an external plugin for it, not something that's built-in. Even the link on the add-ons page is broken for it.

On Sun, Jan 12, 2025, at 1:39 PM, techlists@phpcoderusa.com wrote:
> Thanks Ryan,
> 
> I wonder why ISPConfig is using SquirrelMail?  I recall being very fond 
> of SquirrelMail .  Not sure why.  I need to do some discovery so I can 
> figure out why.
> 
> Thanks!!
> Keith
> 
> 
> < On 2025-01-12 13:31, Ryan Petris wrote:
> > It looks like it got updated in 2021 for PHP 8 support, but it's a
> > "snapshot" release; the latest stable is still from 2011, which is
> > still super old especially with web software.
> > 
> > There are plenty of other newer, better, and maintained webmail
> > software, even if you're looking for something you can just chuck onto
> > a PHP host. Roundcube [1], for instance, is a very capable modern
> > webmail client that just needs to be plopped onto a PHP host, with the
> > latest release being in September, 4 months ago.
> > 
> > On Sun, Jan 12, 2025, at 1:01 PM, techlists@phpcoderusa.com wrote:
> > 
> >> On 2025-01-12 07:50, Ryan Petris wrote:
> >> 
> >>> The last stable release of SquirrelMail was July 12, 2011
> >> according to
> >> 
> >>> wikipedia, which was nearly 14 years ago. I hope you're not still
> >> 
> >>> using it or considering using it.
> >> 
> >>> 
> >> 
> >> Ryan,
> >> 
> >> Interesting point.  ChatGPT say it is no longer supported.  The
> >> website
> >> 
> >> shows something is taking place.  Says it is compatible with PHP
> >> 8.3....
> >> 
> >> ISPConfig is using it.
> >> 
> >> I think this is reason to dig a bit deeper.
> >> 
> >> Thanks!!
> >> 
> >> Keith
> >> 
> >>> On Sun, Jan 12, 2025, at 7:45 AM, Keith Smith via PLUG-discuss
> >> wrote:
> >> 
> >>> 
> >> 
> >>>> Hi,
> >> 
> >>>> 
> >> 
> >>>> Around 2006 or 2007 I had a business website hosted at GoDaddy.
> >> I
> >> 
> >>>> used
> >> 
> >>>> 
> >> 
> >>>> the cheapest web hosting. I think it was around $3.00/mo.  I
> >> 
> >>>> exclusively
> >> 
> >>>> 
> >> 
> >>>> used the GoDaddy webmail which I thought was really good.
> >> 
> >>>> 
> >> 
> >>>> AI tells me GoDaddy was using SquirrelMail at the time,  I think
> >> it
> >> 
> >>>> was
> >> 
> >>>> 
> >> 
> >>>> highly modified by GoDaddy.
> >> 
> >>>> 
> >> 
> >>>> Does anyone know if GoDaddy was using SquirrelMail 18-20 years
> >> ago?
> >> 
> >>>> 
> >> 
> >>>> Thanks!!
> >> 
> >>>> 
> >> 
> >>>> Keith
> >> 
> >>>> 
> >> 
> >>>> ---------------------------------------------------
> >> 
> >>>> 
> >> 
> >>>> PLUG-discuss mailing list: PLUG-discuss@lists.phxlinux.org
> >> 
> >>>> 
> >> 
> >>>> To subscribe, unsubscribe, or to change your mail settings:
> >> 
> >>>> 
> >> 
> >>>> https://lists.phxlinux.org/mailman/listinfo/plug-discuss
> > 
> > 
> > 
> > Links:
> > ------
> > [1] https://roundcube.net/
>