Not valid recipient error when configuring email settings

[leonelamatos]

Steps to reproduce

1. configure email server using smtp mode
2. enter email server name and port
3. enter login information

Expected behaviour

when you send a test email with the configured the settings you should receive an successful email

Actual behaviour

after you hit the send button you receive the error below

Server configuration

Operating system: Linux 20.04

Web server: Microsoft Edge

Database: Sqlite

ownCloud version: (see ownCloud admin page)

• 10.9.1

Updated from an older ownCloud or fresh install:

• Fresh install

Where did you install ownCloud from:

• Docker Hub

Signing status (ownCloud 9.0 and above):

https://gist.github.com/leonelamatos/c532a2cd2b54c2d8e8b845e2f7314e38

The content of config/config.php:

https://gist.github.com/leonelamatos/939e7568acee6970711f90aa76f9d687