I have upgraded to php 5.6 from 5.5 and I'm experiencing some problems with xenforos mailing function.
ErrorException: fwrite(): send of 6 bytes failed with errno=32 Broken pipe - library/Zend/Mail/Protocol/Abstract.php:324
Might I mention that I set in php.ini
openssl.cafile = /usr/local/lsws/php/ca/cert.pem
The pem was downloaded from http://curl.haxx.se/ca/cacert.pem
Also the smtp server is well configured, had not a single problem with php 5.5.