MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:1025 instead of your default SMTP server, then check out http://127.0.0.1:1080 to see the mail that's arrived so far.
Under RVM your mailcatcher command may only available under the ruby you install mailcatcher into. To prevent this, and to prevent gem conflicts, install mailcatcher into a dedicated gemset and create wrapper scripts:
For projects using PHP, or PHP frameworks and application platforms like Drupal, you can set [PHP's mail configuration](http://www.php.net/manual/en/mail.configuration.php) in your [php.ini](http://www.php.net/manual/en/configuration.file.php) to send via MailCatcher with:
sendmail_path = /usr/bin/env catchmail
You can do this in an [Apache htaccess file](http://php.net/manual/en/configuration.changes.php) or general configuration like so:
php_value sendmail_path "/usr/bin/env catchmail"
If you've installed via RVM this probably won't work unless you've manually added your RVM bin paths to your system environment's PATH. In that case, run `which catchmail` and put that path into the `sendmail_path` directive above instead of `/usr/bin/env catchmail`.
A fairly RESTful URL schema means you can download a list of messages in JSON from `/messages`, each message's metadata with `/messages/:id.json`, and then the pertinent parts with `/messages/:id.html` and `/messages/:id.plain` for the default HTML and plain text version, `/messages/:id/:cid` for individual attachments by CID, or the whole message with `/messages/:id.source`.
* Mail processing is fairly basic but easily modified. If something doesn't work for you, fork and fix it or [file an issue][mailcatcher-issues] and let me know. Include the whole message you're having problems with.
* Compatibility testing against CampaignMonitor's [design guidelines](http://www.campaignmonitor.com/design-guidelines/) and [CSS support matrix](http://www.campaignmonitor.com/design-guidelines/).
MailCatcher is just a mishmash of other people's hard work. Thank you so much to the people who have built the wonderful guts on which this project relies.
Thanks also to [The Frontier Group][tfg] for giving me the idea, being great guinea pigs and letting me steal pieces of time to keep the project alive.
I work on MailCatcher mostly in my own spare time. If you've found Mailcatcher useful and would like to help feed me and fund continued development and new features, please [donate via PayPal][donate]. If you'd like a specific feature added to MailCatcher and are willing to pay for it, please [email me](mailto:sj26@sj26.com).