When comparing Roundcube vs Squirrelmail, the Slant community recommends Roundcube for most people. In the question“What are the best self-hosted webmail clients?” Roundcube is ranked 2nd while Squirrelmail is ranked 8th. The most important reason people chose Roundcube is:
Roundcube allows third-party plugins and has a [temporary plugin repository](http://trac.roundcube.net/wiki/Plugin_Repository) (until [the official plugin repository] (http://plugins.roundcube.net/) comes out of beta) with over a hundred plugins available, covering authentication, improved security and settings among many others categories.
Ranked in these QuestionsQuestion Ranking
Pro Plug-in support
Pro Free and open source
Licensed under GPL v3 with code available on GitHub.
Pro Sophisticated address book
Each contact can have their e-mail address, phone number, location, photos and associated URLs added to them. You can then group contacts and address your mails to the group instead of having to enter each person separately. Additionally, you can import vCards and CSV files as contact information. And, it has LDAP connectors.
Pro Access control support
Roundcube has built-in support for access control lists (ACL).
Pro Drag & drop support
Roundcube supports attaching files simply by dragging and dropping them in.
Roundcube is available in over 70 languages.
Pro Multiple identities
You receive mail from multiple sources in one account.
Pro Spell checking
You can enable/disable spellcheck by changing "enable_spellcheck" in main.inc.php file.
Pro Good documentation
You have access to the documentation for APIs as well plugins development.
Pro Built-in caching
Roundcube caches messages to allow quicker access to your mailbox and to alleviate the strain put on the server. You can turn off caching (change 'enable_caching' property in your config/main.inc.php file) if you need messages to appear instantly.
Has auto-refresh functionality for email boxes.
Pro Very mature
Squirrelmail has been around for a long time.
Pro Has many available plugins
Can do things like change Linux user passwords, configure vacation "out of office" messages, configure procmail .forward files, etc.
Not easy to create your own themes.
Con For search there is no reverse index
This means it is very slow.
Unfortunately, all interfaces of roundcube look very old. I hope there will be a progress soon, Google Mail and Outlook Webmail should be the role models here. But also Yahoo mail offers an intuitive design.
If this open source software should survive, it must be completely renewed and bring up to new standards.
Con Extremely clunky unintuitive interface
For example the mouse cursor may start getting stuck and lag.
Con Search option are limited
You can only search for one item at a time instead of multiple search terms, which makes it difficult to go through large amounts of emails.
Con You can't make multiple accounts
It is not possible to make more then one account.
Con Very old
Squirrelmail has been around for a loooooong time!