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Thread-Topic: RFC Proposal: Pluggable Mail Transports
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Date: Sun, 28 Feb 2016 17:55:34 +0000
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Subject: RFC Proposal: Pluggable Mail Transports
From: dolf@transip.nl (Dolf Schimmel)


Howdy,

I'm planning to create an RFC on this shortly, but would like to gauge the =
initial response first.

Currently whenever an email is sent through the mail() function it is sent =
by an invocation of a sendmail-compatible executable. However, there are sc=
enario's in which an alternative transport than through a sendmail executab=
le may be desired. For example when PHP has been locked down, preventing it=
 from starting any executables. It would be nice if it would be possible to=
 allow such an alternative e.g. through a PHP Extension. Of course there ar=
e many frameworks out there that setup an smtp connection themselves, but i=
n a shared hosting environment it's unfeasible to tell users they can't use=
 the mail() function.

This approach is akin to how sessions have a storage handler. PHP by defaul=
t provides the 'file' and 'user' handlers. But the memcached extension prov=
ides a storage mechanism of its own which is then registered through php_se=
ssion_register_module().

This would only implement an extra hook to allow for overriding the default=
 sendmail mail transport (introducing a new ini setting) without bringing e=
xtra functionality to the php user land.

Also, this hook would allow to implement other feature requests, like #2962=
9. [1]

The patch I'm proposing can be found here: https://github.com/php/php-src/p=
ull/1778/files

Cheers,

Dolf


1. https://bugs.php.net/bug.php?id=3D29629=