My configuration:
Slackware64-current
postfix-3.2.2
dovecot-2.2.32
amavisd-new-2.11.0
httpd-2.4.27-x86_64
php-7.1.8
SquirrelMail version: 1.4.23 [SVN]
I can connect to Dovecot and Postfix from command line.
I have no error in SquirrelMail configtest
I can connect to Squirrelmail and send/receive mail BUT my left menu are missing folders INBOX, Draft, Sent and Trash.
In apache log I have only two PHP notice:
[php7:notice] [pid ...][client ...] PHP Notice: Undefined offset: 1 in .../functions/imap_mailbox.php on line 45, referer:.../src/webmail.php
[php7:notice] [pid ...] [client ...] PHP Notice: Undefined index: EXISTS in .../functions/mailbox_display.php on line 439, referer: .../src/webmail.php
Fixed with pcre.jit=0 in php.ini