# telnet-mail **Repository Path**: mirrors_codejamninja/telnet-mail ## Basic Information - **Project Name**: telnet-mail - **Description**: test smtp, imap and pop3 with telnet - **Primary Language**: Unknown - **License**: MIT - **Default Branch**: main - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2020-08-08 - **Last Updated**: 2026-03-21 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # telnet-mail > test smtp, imap and pop3 with telnet ![](assets/telnet-mail.png) ## SMTP #### Encode username ```sh perl -MMIME::Base64 -e 'print encode_base64("hello\@example.com");' ``` #### Encode password ```sh perl -MMIME::Base64 -e 'print encode_base64("world");' ``` ### SMTP 25 #### Open connection ``` telnet mail.example.com 25 ``` ``` Trying 93.184.216.34... Connected to mail.example.com. Escape character is '^]'. 220 mail.example.com ESMTP Postfix (Debian) ``` --- ``` EHLO localhost ``` ``` 250-mail.example.com 250-PIPELINING 250-SIZE 10240000 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-AUTH=PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN ``` #### Authenticate ``` AUTH LOGIN ``` ``` 334 VXNlcm5hbWU6 ``` --- ``` aGVsbG8= ``` ``` 334 UGFzc3dvcmQ6 ``` --- ``` d29ybGQ= ``` ``` 235 2.7.0 Authentication successful ``` #### Send email ``` MAIL FROM: email@example.com ``` ``` 250 2.1.0 Ok ``` --- ``` RCPT TO: email@example.org ``` ``` 250 2.1.5 Ok ``` --- ``` DATA ``` ``` 354 End data with . ``` --- ``` Subject: Hello world . ``` ``` 250 2.0.0 Ok: queued as 941731C4 ``` #### Close connection ``` QUIT ``` ``` 221 2.0.0 Bye Connection closed by foreign host. ``` ### SMTP 587 #### Open connection ``` openssl s_client -starttls smtp -crlf -connect mail.example.com:587 ``` ``` CONNECTED(00000003) depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3 verify return:1 depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 verify return:1 depth=0 CN = mail.example.com verify return:1 --- Certificate chain 0 s:CN = mail.example.com i:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 1 s:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 i:O = Digital Signature Trust Co., CN = DST Root CA X3 --- Server certificate -----BEGIN CERTIFICATE----- MIIFYjCCBEqgAwIBAgISAxXZeGDOdodqxT4UhxwNc/6yMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0yMDA2MTAxNjAwMDVaFw0y MDA5MDgxNjAwMDVaMB8xHTAbBgNVBAMTFHRlc3Quc2lsaWNvbmhpbGxzLmNvMIIB IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAy+pcYHNQKOCe/VqzM4lNpnh8 725ApwmNr2UlB8j6eB2dMTI3y4TO5hdOto1YmLXU+KMTjYMlPGcNM4n3aetDccVH QVHYCPx0Bup9zhQg9kr/wTxXkK24QLKYfsY/WbavnfIG2VQjrTqx8l6sZ6zh0Dnk MySFXXfsTpvW5eCzxzxuVPZfAIvIqx085XwlWYJ0EEkR86rI78F8+m13RJwufNz5 P6SLCWyBDeGyX86M1LYPIgw18XZHBNNuWx3x2AK5wQbIcc1/RKmVc3NgKkf5EXr9 jtaPzhPpr5vqrultt+BGlOJoqds8MDtg8rrYtEpl1o5YQzKRbSzoTgdD4/ukFwID AQABo4ICazCCAmcwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMB BggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBTEW5ZE870KtGjlAZaj SjHRjtFcWzAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBvBggrBgEF BQcBAQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14My5sZXRzZW5j cnlwdC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5sZXRzZW5j cnlwdC5vcmcvMB8GA1UdEQQYMBaCFHRlc3Quc2lsaWNvbmhpbGxzLmNvMEwGA1Ud IARFMEMwCAYGZ4EMAQIBMDcGCysGAQQBgt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0 dHA6Ly9jcHMubGV0c2VuY3J5cHQub3JnMIIBBgYKKwYBBAHWeQIEAgSB9wSB9ADy AHcAXqdz+d9WwOe1Nkh90EngMnqRmgyEoRIShBh1loFxRVgAAAFynyyvJgAABAMA SDBGAiEA1tdH0cgg5v0/Ricjg3sDs1xAJNdv136kYu2x1kxf3vUCIQDhC7Bwf+ox vo5LzLsqdyI1c6gGWDM/lADggl9nHjtuOAB3ALIeBcyLos2KIE6HZvkruYolIGdr 2vpw57JJUy3vi5BeAAABcp8srxEAAAQDAEgwRgIhAOhX6wmVg7T+lvzbKYcaVf92 GHGJ1eao/UFStdc4VKFzAiEA0x+p6CU//x5J97CME+85nI9Rw++mTtKNJbm5gKcV XdcwDQYJKoZIhvcNAQELBQADggEBAAWTVlFwPCCiKA5jP0H1jgtOumpqHkGVPo0o xPv9k47EBh6UnU+L5W2RtJjAWcZF1U75pR3zQMXk0TSDtxI22dbQH5aYkYaKYWYU AlXS5PdauSnKI1Fb1OB8Gn13U4z9lihyHC0ylYcoJYg5lh/cpRHwEErpJS5j0rKL gFYgzt+P94BYROW6KBnFCLr6RLM9SfwTEX4+f2l5dqpFOMc9Im6tAdyHCOPnkkdq GA3TAJzNDmFhf26DLfqRS6IzfBOgIleCJ/qGNc5G+hLAO8/4gT3ZkHbKwcW8LIDM xWz91SqRjdsILDV9hLT/9G1uWlliqYSbeGWE8StA2gyWbo+X8mw= -----END CERTIFICATE----- subject=CN = mail.example.com issuer=C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 --- No client certificate CA names sent Peer signing digest: SHA512 Peer signature type: RSA Server Temp Key: ECDH, P-256, 256 bits --- SSL handshake has read 3461 bytes and written 481 bytes Verification: OK --- New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384 Server public key is 2048 bit Secure Renegotiation IS supported Compression: NONE Expansion: NONE No ALPN negotiated SSL-Session: Protocol : TLSv1.2 Cipher : ECDHE-RSA-AES256-GCM-SHA384 Session-ID: 4C458E6D4FBE5636024E418E05A83EB2CE76FC12118C8155513CE01695A485BD Session-ID-ctx: Master-Key: E0D221502C950C8B8603C7F3CCD6C3929570119F1F929E32F97D8F3B78D76A5D8473428AA67F473A1A1F16112A626921 PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 7200 (seconds) TLS session ticket: 0000 - 9a 0c ac 1f 3f e4 9f be-b1 3d 24 da 4f 93 a8 20 ....?....=$.O.. 0010 - e0 19 dc e6 8f 6c aa 46-79 ef fe 04 22 10 8e c0 .....l.Fy..."... 0020 - 3b 8a 55 a9 86 16 64 2b-e0 a5 89 d1 3d f7 5e e3 ;.U...d+....=.^. 0030 - 0a df 4a d9 59 77 c1 33-25 a4 b3 f9 a1 7d 05 24 ..J.Yw.3%....}.$ 0040 - f8 e9 71 7c c3 75 0b 29-05 41 13 d2 f2 e1 e2 db ..q|.u.).A...... 0050 - c6 8d 3a 34 b0 54 8d 47-41 32 a0 ef 5d 1e 6a ce ..:4.T.GA2..].j. 0060 - 2e f7 85 28 8a 3a 88 74-40 85 b1 e4 8d 8e 79 93 ...(.:.t@.....y. 0070 - 10 88 08 d6 4b fa 42 5a-31 6c f5 71 07 48 65 48 ....K.BZ1l.q.HeH 0080 - 51 e9 7a 39 26 cc f8 9a-b6 40 c7 48 9d 87 cb 33 Q.z9&....@.H...3 0090 - 78 a7 17 67 bb 0d 7e e7-2e f9 93 3b 2c 57 fe 7d x..g..~....;,W.} 00a0 - bb b2 ec 9e cd d6 92 73-f1 9d 53 6f c0 f6 c4 98 .......s..So.... 00b0 - 8c a5 0e 51 34 23 24 64-dd 6f e3 b4 1f dc 5c e5 ...Q4#$d.o....\. Start Time: 1591881644 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: yes --- 250 DSN ``` --- ``` EHLO localhost ``` ``` 250-mail.example.com 250-PIPELINING 250-SIZE 10240000 250-ETRN 250-AUTH PLAIN LOGIN 250-AUTH=PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN ``` #### Authenticate ``` AUTH LOGIN ``` ``` 334 VXNlcm5hbWU6 ``` --- ``` aGVsbG8= ``` ``` 334 UGFzc3dvcmQ6 ``` --- ``` d29ybGQ= ``` ``` 235 2.7.0 Authentication successful ``` #### Send email ``` MAIL FROM: email@example.com ``` ``` 250 2.1.0 Ok ``` --- ``` RCPT TO: email@example.org ``` ``` 250 2.1.5 Ok ``` --- ``` DATA ``` ``` 354 End data with . ``` --- ``` Subject: Hello world . ``` ``` 250 2.0.0 Ok: queued as 941731C4 ``` #### Close connection ``` QUIT ``` ``` 221 2.0.0 Bye Connection closed by foreign host. ``` ## IMAP ### IMAP 143 #### Open connection ``` telnet mail.example.com 143 ``` ``` Trying 93.184.216.34... Connected to mail.example.com. Escape character is '^]'. * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ STARTTLS LOGINDISABLED] Dovecot ready. ``` #### Authenticate ``` . LOGIN hello world ``` ### IMAP 993 #### Open connection ``` openssl s_client -connect mail.example.com:993 ``` ``` CONNECTED(00000003) depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3 verify return:1 depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 verify return:1 depth=0 CN = mail.example.com verify return:1 --- Certificate chain 0 s:CN = mail.example.com i:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 1 s:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 i:O = Digital Signature Trust Co., CN = DST Root CA X3 --- Server certificate -----BEGIN CERTIFICATE----- MIIFYjCCBEqgAwIBAgISAxXZeGDOdodqxT4UhxwNc/6yMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0yMDA2MTAxNjAwMDVaFw0y MDA5MDgxNjAwMDVaMB8xHTAbBgNVBAMTFHRlc3Quc2lsaWNvbmhpbGxzLmNvMIIB IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAy+pcYHNQKOCe/VqzM4lNpnh8 725ApwmNr2UlB8j6eB2dMTI3y4TO5hdOto1YmLXU+KMTjYMlPGcNM4n3aetDccVH QVHYCPx0Bup9zhQg9kr/wTxXkK24QLKYfsY/WbavnfIG2VQjrTqx8l6sZ6zh0Dnk MySFXXfsTpvW5eCzxzxuVPZfAIvIqx085XwlWYJ0EEkR86rI78F8+m13RJwufNz5 P6SLCWyBDeGyX86M1LYPIgw18XZHBNNuWx3x2AK5wQbIcc1/RKmVc3NgKkf5EXr9 jtaPzhPpr5vqrultt+BGlOJoqds8MDtg8rrYtEpl1o5YQzKRbSzoTgdD4/ukFwID AQABo4ICazCCAmcwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMB BggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBTEW5ZE870KtGjlAZaj SjHRjtFcWzAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBvBggrBgEF BQcBAQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14My5sZXRzZW5j cnlwdC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5sZXRzZW5j cnlwdC5vcmcvMB8GA1UdEQQYMBaCFHRlc3Quc2lsaWNvbmhpbGxzLmNvMEwGA1Ud IARFMEMwCAYGZ4EMAQIBMDcGCysGAQQBgt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0 dHA6Ly9jcHMubGV0c2VuY3J5cHQub3JnMIIBBgYKKwYBBAHWeQIEAgSB9wSB9ADy AHcAXqdz+d9WwOe1Nkh90EngMnqRmgyEoRIShBh1loFxRVgAAAFynyyvJgAABAMA SDBGAiEA1tdH0cgg5v0/Ricjg3sDs1xAJNdv136kYu2x1kxf3vUCIQDhC7Bwf+ox vo5LzLsqdyI1c6gGWDM/lADggl9nHjtuOAB3ALIeBcyLos2KIE6HZvkruYolIGdr 2vpw57JJUy3vi5BeAAABcp8srxEAAAQDAEgwRgIhAOhX6wmVg7T+lvzbKYcaVf92 GHGJ1eao/UFStdc4VKFzAiEA0x+p6CU//x5J97CME+85nI9Rw++mTtKNJbm5gKcV XdcwDQYJKoZIhvcNAQELBQADggEBAAWTVlFwPCCiKA5jP0H1jgtOumpqHkGVPo0o xPv9k47EBh6UnU+L5W2RtJjAWcZF1U75pR3zQMXk0TSDtxI22dbQH5aYkYaKYWYU AlXS5PdauSnKI1Fb1OB8Gn13U4z9lihyHC0ylYcoJYg5lh/cpRHwEErpJS5j0rKL gFYgzt+P94BYROW6KBnFCLr6RLM9SfwTEX4+f2l5dqpFOMc9Im6tAdyHCOPnkkdq GA3TAJzNDmFhf26DLfqRS6IzfBOgIleCJ/qGNc5G+hLAO8/4gT3ZkHbKwcW8LIDM xWz91SqRjdsILDV9hLT/9G1uWlliqYSbeGWE8StA2gyWbo+X8mw= -----END CERTIFICATE----- subject=CN = mail.example.com issuer=C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3 --- No client certificate CA names sent Peer signing digest: SHA512 Peer signature type: RSA Server Temp Key: X25519, 253 bits --- SSL handshake has read 3220 bytes and written 415 bytes Verification: OK --- New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384 Server public key is 2048 bit Secure Renegotiation IS supported Compression: NONE Expansion: NONE No ALPN negotiated SSL-Session: Protocol : TLSv1.2 Cipher : ECDHE-RSA-AES256-GCM-SHA384 Session-ID: 56FBA976FFC4E8F6C9495D8465DF4769442917E575E85405E7BFCB761764CA64 Session-ID-ctx: Master-Key: 991FD5BF3BA4284AC21534127FB7D477F17BCF39DBEA6C51F4ED70473C006BE1FBEA00F379147B240FE268ABBE39DDDA PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 7200 (seconds) TLS session ticket: 0000 - e0 77 c3 48 a2 e0 91 f2-d0 d9 5f 49 f1 cb 06 3b .w.H......_I...; 0010 - 4a 02 e6 1b 56 5c 3b e8-42 6f 70 fd d0 bb 34 0d J...V\;.Bop...4. 0020 - c3 8e 7e 73 91 fd 79 2b-64 48 7d 1a 8d 49 ab f1 ..~s..y+dH}..I.. 0030 - 91 52 68 c2 d7 23 d3 53-69 42 87 db 5b d0 ce 39 .Rh..#.SiB..[..9 0040 - 43 c9 40 08 bc 4f 5c df-54 8b 1b dd ed 3c 64 6a C.@..O\.T.... Subject: draft To: someone@example.com ----=_RainLoop_201_134599085.1594509491 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable I am a draft ----=_RainLoop_201_134599085.1594509491 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

<= br>I am a draft

----=_RainLoop_201_134599085.1594509491-- ) . OK Fetch completed (0.001 + 0.000 secs). ```