220 mustogirlsingle.de ESMTP service ready
250-mustogirlsingle.de says hello
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250-8BITMIME
250-AUTH CRAM-MD5
250-AUTH=CRAM-MD5
250-XACK
250-SIZE 0
250-VERP
250 DSN

nginx

HTTP/1.1 200 OK
Server: nginx
Date: Wed, 30 Oct 2024 00:05:46 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block

Squid http proxy3.5.20

HTTP/1.1 400 Bad Request
Server: squid/3.5.20
Mime-Version: 1.0
Date: Thu, 31 Oct 2024 04:29:38 GMT
Content-Type: text/html;charset=utf-8
Content-Length: 3509
X-Squid-Error: ERR_INVALID_URL 0
Vary: Accept-Language
Content-Language: en
Connection: close