SMTP debugging help

Hi dear community,

I am having trouble with the smtp part of passbolt, and I am not super used to debugging smtp, so I thought maybe someone here can share some tricks?

Right now, I am usign openssl like this: openssl s_client -starttls smtp -crlf -connect mail.systemli.org:587 and then I try to enter the correct keywords.

Can someone tell me how I am supposed to answer to a response like this (I sent EHLO localhost):

250-mail1.systemli.org
250-PIPELINING
250-SIZE 40960000
250-ETRN
250-AUTH PLAIN
250-AUTH=PLAIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250 CHUNKING