SMTP Authentication failed

[Former user]

Hello I am using the latest docker image and been able to setup everything. Until I tried to send an email into roundcube and got an error: SMTP Authentication failed.

I checked the logs of qpsmtp and I see this:

FATAL PLUGIN ERROR [auth::auth_database]: Can't open pipe: Cannot allocate memory at ./plugins/auth/auth_database line 56.

Any idea, why?

[SH]

Cannot allocate memory

How much memory you have? Any full stack mailserver is not lowmem software anymore