How to use PHP mail() method

[viniciusbig]

I'm using the default php image with CakePHP.
It works very well for my usecases!

I'm trying to send emails witth mail() php method.
and getting an error

mail(/proc/1/fd/2): Failed to open stream: Permission denied

PHP info shows:

sendmail_path `/usr/sbin/sendmail -t -i`

but this exec does not exist.

My question is:
What is the easiest way to have this library installed in docker?
Does anybody have a working example of it?

Trying to understand this.

Thanks

[shinsenter]

Hi @viniciusbig

Could you please let me know since when you’ve been encountering this error?
Also, could you copy and share the information from the welcome message shown when the container starts? (I need to know the build version of the Docker image you’re using.)

[viniciusbig]

Well, I think it's happening since I switched to version 5 of the images. In version 4, it was working.

I thought this was intentional, so I brought it here to find a possible solution.

This is my welcome message.

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If you find my Docker images useful, consider donating via PayPal:
-> https://www.paypal.me/shinsenter
(To edit this welcome message, add your text to /etc/welcome.txt)
---------------
Container : shinsenter/phpfpm-apache (built: 2025-03-19T02:21:51+0000)
Distro : Debian GNU/Linux 12 (bookworm)
Timezone : UTC (GMT+0000)
UID / GID : www-data:www-data (927630319:635061173)
App Root : /var/www/html
Document Root : /var/www/html
---------------
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To get support, please contact: SHIN Company <[email protected]>
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PHP 8.3.19 (fpm-fcgi) (built: Mar 18 2025 05:44:25)
Copyright (c) The PHP Group
Zend Engine v4.3.19, Copyright (c) Zend Technologies
with Zend OPcache v8.3.19, Copyright (c), by Zend Technologies
Composer version 2.8.8 2025-04-04 16:56:46
Cron is running as www-data.
### Config:
CRON_TZ=America/Sao_Paulo
HOME=/var/www/html
PATH=/command:/var/www/html/vendor/bin:/.composer/vendor/bin:/usr/local/nvm/versions/node/lts/iron/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
SHELL=/bin/sh
# Job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * command to be executed
Server version: Apache/2.4.62 (Debian)
Server built: 2024-10-04T15:21:08
Syntax OK

[shinsenter]

@viniciusbig
Thank you for the information.
I suggest you try pulling the newer version of the Docker image. In the latest images, sendmail has been replaced by msmtp for sending emails.

You’ll need to configure SMTP using the following environment variables in this section:
https://github.com/shinsenter/php?tab=readme-ov-file#sending-emails