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== port 25 ==
• openssl s_client -starttls smtp -host g.pyon.org -port 25

== port 587 ==
mail submission port

{{{
$ openssl s_client -host smtp.gmail.com -port 587 -starttls smtp
Connecting to 142.251.170.109
CONNECTED(00000003)
depth=2 C=US, O=Google Trust Services LLC, CN=GTS Root R1
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=1 C=US, O=Google Trust Services LLC, CN=GTS CA 1C3
verify return:1
depth=0 CN=smtp.gmail.com
verify return:1
---
Certificate chain
 0 s:CN=smtp.gmail.com
   i:C=US, O=Google Trust Services LLC, CN=GTS CA 1C3
   a:PKEY: id-ecPublicKey, 256 (bit); sigalg: RSA-SHA256
   v:NotBefore: Nov 20 08:09:17 2023 GMT; NotAfter: Feb 12 08:09:16 2024 GMT
 1 s:C=US, O=Google Trust Services LLC, CN=GTS CA 1C3
   i:C=US, O=Google Trust Services LLC, CN=GTS Root R1
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: Aug 13 00:00:42 2020 GMT; NotAfter: Sep 30 00:00:42 2027 GMT
 2 s:C=US, O=Google Trust Services LLC, CN=GTS Root R1
   i:C=BE, O=GlobalSign nv-sa, OU=Root CA, CN=GlobalSign Root CA
   a:PKEY: rsaEncryption, 4096 (bit); sigalg: RSA-SHA256
   v:NotBefore: Jun 19 00:00:42 2020 GMT; NotAfter: Jan 28 00:00:42 2028 GMT
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=CN=smtp.gmail.com
issuer=C=US, O=Google Trust Services LLC, CN=GTS CA 1C3
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: ECDSA
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 4581 bytes and written 435 bytes
Verification error: unable to get local issuer certificate
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 256 bit
This TLS version forbids renegotiation.
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 20 (unable to get local issuer certificate)
---
250 SMTPUTF8

}}}

== history ==
{{{

}}}
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