Thanks Stephen! You are right.
It really looks like that there is no IMAP extension in PHP.
Here is listing:
PHP Version 4.3.11
System Linux web2.m****here.biz 2.4.21-20.ELsmp #1 SMP Wed Aug 18 20:46:40 EDT 2004 i686
Build Date Jun 20 2005 21:58:58
Configure Command './configure' '--localstatedir=/var/hsphere/php' '--with-apxs=/hsphere/shared/apache/bin/apxs' '--with-openssl=/usr' '--with-zlib=/usr' '--with-zlib-dir=/usr' '--with-bz2=/usr' '--enable-calendar' '--with-jpeg-dir=/usr' '--enable-ftp' '--with-gd' '--with-ttf' '--with-freetype-dir=/usr' '--enable-gd-native-ttf' '--with-png-dir=/usr' '--with-gettext=/usr' '--with-imap=/hsphere/shared' '--with-mysql=/usr' '--with-pgsql=/usr' '--with-curl=/usr' '--with-curlwrappers' '--with-mhash=/usr' '--with-iconv=/hsphere/shared' '--enable-sockets' '--with-zip=/usr' '--enable-versioning' '--enable-track-vars' '--enable-trans-sid' '--enable-bcmath' '--enable-mbstring' '--disable-debug' '--with-dom=/usr/lib' '--with-dom-xslt=/usr/lib' '--with-dom-exslt=/usr/lib' '--with-oci8-instant-client' '--with-pfpro=/usr/local/verisign/payflowpro/linuxrh9'
Server API Apache
Virtual Directory Support disabled
Configuration File (php.ini) Path /usr/local/Zend/etc/php.ini
PHP API 20020918
PHP Extension 20020429
Zend Extension 20021010
Debug Build no
Thread Safety disabled
Registered PHP Streams php, http, ftp, https, ftps, compress.bzip2, compress.zlib
So, do anybody know if there is any possibility to get this IMAP support for my site?