Sending emails in Silverstripe 5

Questions
1

Silverstripe Version: 5

Question:

I have just updated an old silverstripe 3 site to silverstripe 5. Everything is good except that it does not send emails. I have tried adding the following .env variables:

MAILER_DSN="smtp://user@domain.com:password@mail.domain.com:465"
MAILER_DSN="smtp://user@domain.com:password@smtp.domain.com:587"
MAILER_DSN="sendmail://default"

I have run dev/build?flush=all after each change. At best I get error messages and at worst it is an internal server error and nothing gets written to the error log.

I have also tried adding a mailer-project.yml file with the following in it:

---
Name: mailer-project
After: 'mailer'
---

SilverStripe\Core\Injector\Injector:
  Symfony\Component\Mailer\Transport\TransportInterface:
    constructor:
      dsn: '%env(MAILER_DSN)%'

The error messages I have gotten are:

# [Emergency] Uncaught Symfony\Component\Mailer\Exception\InvalidArgumentException: The mailer DSN must contain a scheme.

ERROR: Uncaught Exception Error: "Call to undefined function Symfony\Component\Mailer\Transport\Smtp\Stream\proc_open()" at /home/mcscomau/public_html/vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php line 41 {"exception":"[object] (Error(code: 0): Call to undefined function Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\proc_open() at /home/.../public_html/vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php:41)"} []

What am I missing? I have not used Silverstripe much in the last year or two, so I am a bit rusty with it all.

Thanks

2

I don’t know where you got the syntax for '%env(MAILER_DSN)%' but to use an environment variable with injector configuration the syntax is '`MAILER_DNS`'
See https://docs.silverstripe.org/en/5/developer_guides/extending/injector/#using-constants-and-environment-variables

3

The %env bit came out of Symfony docs.

I could not get it to work with the .env variable. Anytime I loaded the .env file up with a MAILER_DNS variable it wound up causing an internal server error.

So I put the full smtp://user@domain.com:password@mail.domain.com:465 in the yml file and set a SS_SEND_ALL_EMAILS_FROM variable in the .env file.

For anyone else that might have this issue, it is also worth ensuring the password does not contain special characters.

4

May not be useful exactly to the OP but maybe someone somewhere…

How I do it with MailGun API and Docker compose is simply:

MAILER_DSN: "mailgun+api://key-<your_key>:<your_address>@default"

In the environment section of the docker-compose file.

Swap <your_key> and <your_address> for your values.