php8.3 support and deprecated functions

HI,
Latest from daily stable snapshots with PHP debugging enabled. This is
fedora40 with php-8.3.9.

Deprecated: Creation of dynamic property Deliver_SMTP::$dlv_ret_nr is
deprecated in
/usr/share/squirrelmail-stable-1.4.23-svn-073024/class/deliver/Deliver_SMTP.class.php
on line 427

Deprecated: Creation of dynamic property Deliver_SMTP::$dlv_msg is
deprecated in
/usr/share/squirrelmail-stable-1.4.23-svn-073024/class/deliver/Deliver_SMTP.class.php
on line 484

Deprecated: Creation of dynamic property Deliver_SMTP::$dlv_server_msg is
deprecated in
/usr/share/squirrelmail-stable-1.4.23-svn-073024/class/deliver/Deliver_SMTP.class.php
on line 485

Warning: Cannot modify header information - headers already sent by (output
started at
/usr/share/squirrelmail-stable-1.4.23-svn-073024/class/deliver/Deliver_SMTP.class.php:427)
in /usr/share/squirrelmail-stable-1.4.23-svn-073024/functions/global.php on
line 594

Warning: Cannot modify header information - headers already sent by (output
started at
/usr/share/squirrelmail-stable-1.4.23-svn-073024/class/deliver/Deliver_SMTP.class.php:427)
in /usr/share/squirrelmail-stable-1.4.23-svn-073024/functions/global.php on
line 594

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