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250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250-8BITMIME
250-AUTH CRAM-MD5 PLAIN LOGIN
250-AUTH=CRAM-MD5 PLAIN LOGIN
250-XACK
250-SIZE 0
250-VERP
250 DSN

HTTP/1.1 503 Service Unavailable
Content-Type: text/html; charset=us-ascii
Server: Microsoft-HTTPAPI/2.0
Date: Fri, 07 Jun 2024 14:36:57 GMT
Connection: close
Content-Length: 326