On Sun, Dec 15, 2019 at 05:29:27PM -0500, John Levine wrote:
> $ telnet -4 mail.ietf.org 25
> Trying 4.31.198.44...
> Connected to mail.ietf.org.
> Escape character is '^]'.
> 220 ietfa.amsl.com ESMTP
> ehlo [64.57.183.53]
> 250-ietfa.amsl.com
> 250-PIPELINING
> 250-SIZE 67108864
> 250-ETRN
> 250-STARTTLS
> 250-AUTH PLAIN LOGIN
> 250-AUTH=PLAIN LOGIN
> 250-ENHANCEDSTATUSCODES
> 250 8BITMIME
> quit
> 221 2.0.0 Bye
Postfix delays HELO checks until RCPT TO. You'd need to go all the way
to RCPT TO:
$ telnet mail.ietf.org 25
220 ietfa.amsl.com ESMTP
EHLO [100.2.39.101]
250-ietfa.amsl.com
250-PIPELINING
250-SIZE 67108864
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250 8BITMIME
mail from:<ietf-dane@xxxxxxxxxxxx>
250 2.1.0 Ok
rcpt to:<ietf@xxxxxxxx>
550 5.7.1 <[100.2.39.101]>: Helo command rejected: RFC2821 violation
quit
221 2.0.0 Bye
Connection closed by foreign host.
--
Viktor.
