[matteocontrini]

Another thing is that they appear to have some spam scanning on outbound emails and when they detect something suspicious they simply drop the email silently, and nobody will ever know about it.

[sumuyuda]

You can turn this off in the settings and the spam will go in a Junk folder.

https://kb.mailbox.org/en/private/e-mail-article/customizing...

[matteocontrini]

I'm referring to outbound email being silently dropped, not inbound email being rejected or put into Junk.