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postfix
No emails are actually ever sent to avoid any potential leaks and errors that could affect actual users. Instead all emails, including system/root ones, are re-routed to the vagrant user.
How emails are then treated depends on the value of mail_delivery variable in
your config file. It can take one of the following values:
This is the default behaviour. All emails are stored as .eml files in a ce-vm/var/$service/Maildir folder, accessible from your host. You can then conveniently open then in the destop mail client of your choice.
Email adopts the standard Linux behaviour, and is only accessible from the guest,
using the mail command. This is mostly ony useful if you want to stick to the
command line and/or manipulate the mailq in some manner.
Email is sent directly to /dev/null, thus non-accessible. Use this if your app generates a large amount of mail you don't need and want to save disk space.
A lot of similar stacks includes some web-based interceptors, eg MailHog or MailCatcher.
However, intercepting emails directly at the Postfix level presents two main advantages over such solutions.
1. Accurate rendering: You don't have to rely on web based HTML rendering. Wondering how your nicely crafted newsletter is going to look in Outlook or Thunderbird ? Just check using the actual sofware.
2. System-wide: No per application settings, no further configuration, no corner cases missed. Email will behave the same for cron jobs, PHP, python or NodeJS apps.