Connection to ssl://smtp_server:465 Timed Out

[cent89]

Description:

I've a Laradock configured with redis, php-worker and horizon. I can't send some email, the log error is a generic:

Connection to ssl://smtp.eu.mailgun.org:465 Timed Out at /var/www/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)

The same behavior with other smtps server. The email is always in pending status...
If I restarted all containers, some mails (20-30) are sended correctly but after a time the same error occurs.

In php-fpm container, I can't ping the smtp server:

380 packets transmitted, 0 received, 100% packet loss, time 465ms.

Expected Behavior:

Context information:

Output of git rev-parse HEAD

f31bb7e13eb09151c910ac191cf013b07913d20f

Output of docker version

Version:           19.03.15
 API version:       1.40

Output of docker-compose version

docker-compose version 1.29.1, build c34c88b2

System info: Mac, Windows or Linux. Include which disto/version

Debian 9

[stale]

Hi 👋 this issue has been automatically marked as stale 📌 because it has not had recent activity 😴. It will be closed if no further activity occurs. Thank you for your contributions ❤️.

[stale]

Hi again 👋 we would like to inform you that this issue has been automatically closed 🔒 because it had not recent activity during the stale period. We really really appreciate your contributions, and looking forward for more in the future 🎈.

[hongphucbk]

I also have the same issue

Swift_IoException: Connection to ssl://smtppro.zoho.com:465 Timed Out in C:\xampp\htdocs\hse\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\StreamBuffer.php:166