Sendmail8.14.7/8.14.7

220 localhost.localdomain.com ESMTP Sendmail 8.14.7/8.14.7; Thu, 2 Jan 2025 09:47:55 -0500
250-localhost.localdomain.com Hello 224.111.191.246 [224.111.191.246], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP

nginx

HTTP/1.1 200 OK
Server: nginx
Date: Sun, 26 Jan 2025 01:16:31 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
X-Powered-By: PHP/5.6.40

220 expres.slingcarsmeaty.com ESMTP service ready
250-expres.slingcarsmeaty.com 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-SMTPUTF8
250 DSN