by Oliver
13. June 2013 15:27
This post is most of all a log drop of an SMTP session I had with our mail server over telnet. We use hMailServer for all of our own and hosted e-mail accounts. Today, I set up a new account to use for our SQL servers to report any problems. I couldn't get SQL Server's DatabaseMail to successfully send any e-mail so I went to find out what might be wrong by myself. Here's my first successful chat with our mail server using AUTH LOGIN, i.e. username and password authentication: 1: 220 mail.teamaton.com ESMTP // started session with: telnet mail.teamaton.com 25
2: hello // my first try - not quite ;-)
3: 502 Use HELO/EHLO first.
4: HELO // ok, I got you
5: 501 HELO Invalid domain address.
6: HELO // say again?
7: 502 Use HELO/EHLO first.
8: EHLO 25.0.153.55 // send a host name of the computer you're on
9: 250-mail.teamaton.com
10: 250-SIZE 15000000
11: 250 AUTH LOGIN
12: MAIL FROM: <sql*******@teamaton.com> // the from address to use for the e-mail
13: 250 OK
14: RCPT TO: <oliver*******@******.com> // trying to set a recipient's address
15: 530 SMTP authentication is required.
16: AUTH LOGIN // initiating login
17: 334 VXNlcm5hbWU6 // the server is asking for my username in base64 encoding
18: c3FsLXNl***************vbi5jb20= // sending my username in base64 encoding
19: 334 UGFzc3dvcmQ6 // the server is asking for my password in base64 encoding
20: YkZwN***************A1dng= // sending my password in base64 encoding
21: 535 Authentication failed. Restarting authentication process. // oops, I copied some invisible character from that encoding web page
22: auth login // try again
23: 502 Unimplemented command. // case seems to matter
24: AUTH LOGIN
25: 334 VXNlcm5hbWU6
26: c3FsLXNl***************vbi5jb20=
27: 334 UGFzc3dvcmQ6
28: YkZwN***************A1dng=
29: 235 authenticated. // finally!
30: DATA // set the body of the e-mail
31: 503 Must have sender and recipient first. // hm, I thought I set the sender already…
32: MAIL FROM: <sql*******@teamaton.com> // oh well, set it again
33: 503 Issue a reset if you want to start over // I didn't want to start over!
34: RCPT TO: <oliver*******@******.com> // set only the missing recipient, then
35: 250 OK
36: DATA // now, set the mail body
37: 354 OK, send.
38: Test mail here.
39:
40: . // mark the end of the mail body
41: 250 Queued (11.247 seconds)
42: 421 Connection timeout. // that's what happened after a while when I left the shell open
43:
44: Connection to host lost.
45:
46: C:\Users\Oliver>
Every line that starts with a status code was sent by the server, the rest of them is what I entered.
Just for the record.