Package: wordpress
Version: 4.4.2+dfsg-1~bpo8+1

Upstream WordPress includes phpmailer as class-phpmailer.php in its
wp-includes directory. In the Debian package for Jessie backports, this
class is provided by the libphp-phpmailer package, currently in version
5.2.9

Wordpress 4.4.2 an even 4.4.1 before however, is shipping with version
5.2.14 of phpmailer which brings an extended API, for example the method
getCustomHeaders().

Some WordPress plugins begin to rely on this API and will break (ending
the entire PHP process with a Fatal Error) when WordPress has been
installed from the Debian repositories rather than the upstream sources.

I know libphp-phpmailer is being used from the repositories rather than
included with the wordpress package for security reasons. I also do not
have any recommendation on how to solve this issue.

See also:
https://wordpress.org/support/topic/broken-with-wp-441-which-ships-with-phpmailer-529

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