Score:0

SMTP Authentication encryption

sv flag

I have working on trying to get an smtp server setup with postfix and dovecot.

When running telnet localhost 25 and execute ehlo localhost directly from the system I get the following

250-smtp.mydomain.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING

When I execute openssl s_client -connect localhost:25 -starttls smtp directly from the system I get the following

CONNECTED(00000003)
4027421F1E7F0000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:354:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 319 bytes and written 355 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---

This will be a send only server. I do have a certificate from lets encrypt.

What do I need to do to fix this problem?

Thank You

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