Unable to Send emails from taiga when adding members

Hi,

We’ve set up Taiga on our servers and successfully imported the projects. However, we’re facing an issue where emails aren’t sent when inviting people from the “Add members” section.

Taiga is hosted via Docker.

taiga-back-1 | [2024-07-05 22:02:11 +0000] [1] [CRITICAL] WORKER TIMEOUT (pid:92)
taiga-gateway-1 | 172.31.51.33 - - [05/Jul/2024:22:02:11 +0000] "POST /api/v1/memberships/bulk_create HTTP/1.1" 502 560 "https://projects.unicopower.com/project/software-dev/admin/memberships" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36" "206.116.118.46"
taiga-gateway-1 | 2024/07/05 22:02:11 [error] 30#30: *1640 upstream prematurely closed connection while reading response header from upstream, client: 172.31.51.33, server: , request: "POST /api/v1/memberships/bulk_create HTTP/1.1", upstream: "http://172.18.0.8:8000/api/v1/memberships/bulk_create", host: "projects.unicopower.com", referrer: "https://projects.unicopower.com/project/software-dev/admin/memberships"
taiga-back-1 | [2024-07-05 22:02:12 +0000] [100] [INFO] Booting worker with pid: 100
taiga-front-1 | 172.18.0.10 - - [05/Jul/2024:22:02:13 +0000] "GET / HTTP/1.0" 200 140629 "-" "ELB-HealthChecker/2.0" "-"

I have properly configured my .env file for email sending. Initially, Taiga could send emails for project ownership, confirming that the email setup was functioning correctly.