Problem with TLS 1.2 and SMTP

[mosse.francisco]

Hi,
I am having a problem with a new DirectAdmin installation. Clients that use old Outlooks like 2003, 2007 etc can´t send emails

Sending' reported error (0x800CCC1A): 'Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server administrator or Internet service provider (ISP) for assistance.'

Inside /etc/exim.variables.conf.custom
I have

tls_require_ciphers =
openssl_options = +no_sslv2 +no_sslv3 +no_tlsv1 +no_tlsv1_1
daemon_smtp_ports = 25 : 465 : 587 : 2525
tls_on_connect_ports = 465

In SSH when I run
openssl s_client -connect 127.0.0.1:465 -tls1_2

I receive this:

CONNECTED(00000003)
write:errno=104
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 188 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : TLSv1.2
Cipher : 0000
Session-ID:
Session-ID-ctx:
Master-Key:
PSK identity: None
PSK identity hint: None
SRP username: None
Start Time: 1753062294
Timeout : 7200 (sec)
Verify return code: 0 (ok)
Extended master secret: no
---
root@da:/usr/local/directadmin/custombuild#


How can I fix it?

Thanks,
Francisco

 

[Active8]

I have client that still using outlook(office) 2007 with the latest DA (TLS 1.2 +1.3) so that should be not the reason.
Check the connection settings inside outlook e.g IMAP = inbound = port 993 SSL / outbound port 587 STARTTLS or port 465 SSL