Проверка почтового сервера

-> Connect to mail.atomsk.ru:587
220 mail.atomsk.ru Microsoft ESMTP MAIL Service ready at Mon, 1 Sep 2025 02:32:30 +0500
-> EHLO uptimebot.ru
250-mail.atomsk.ru Hello [93.157.173.90]
250-SIZE 209715200
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH GSSAPI NTLM LOGIN
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
### STARTTLS not found ###
-> quit
221 2.0.0 Service closing transmission channel