Good day.
Tell me, please, on this issue: When I connect to the SMTP service via the command line (telnet), I see the greeting of the service. But when I try to enter a command, when I manage to enter 2-4 characters, the service responds:
220 <ัะบัััะพ> Service ready EH500 command unrecognized 500 command unrecognized L500 command unrecognized
A similar situation takes place when I try to connect via a socket (C #) - I receive only the greeting service, and the service responds with error 500 to all my commands (as in the quote above).
Tell me, this is what I call the service wrong. or does it work incorrectly? The SMTP service itself is self-written.
The commands that I give to the service:
- EHLO smtp.server
- MAIL FROM:
- RCPT TO:
- Data
- text of the letter
- Quit
