kapetr:
> Hello,
>
> I use posfix as forwarder.
>
> The target server is connected via stunnel4. It was working, but now
> I have changed ISP and the new smpt server has problem with Posfix
> as client.
>
> Here is TCP stream from Wireshark:
>
> xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> 220 mailout2.t-email.cz ESMTP
> EHLO 251-43-13-46.tmcz.cz
> 250-mailout2.t-email.cz
> 250-PIPELINING
> 250-SIZE 15360000
> 250-VRFY
> 250-ETRN
> 250-AUTH LOGIN PLAIN
> 250-ENHANCEDSTATUSCODES
> 250-8BITMIME
> 250 DSN
> AUTH LOGIN
> 334 XXXXXXXXXX
> YYYYYYY
> 334 XXXXXXXXX
> YYYYYYY
> 235 2.7.0 Authentication successful (this is the final reply to AUTH)
> MAIL FROM:<jiri.pa...@xxxxx.cz> SIZE=517 AUTH=<>
> RCPT TO:<ji...@xxxxxoma.cz> ORCPT=rfc822;ji...@xxxxxoma.cz
> DATA
> 250 2.1.0 Ok (this is the reply to *what*?)
> 555 5.5.4 Unsupported option: AUTH=<> (this would be the reply to MAIL FROM)
(there should be an RCPT TO reply here)
> 554 5.5.1 Error: no valid recipients (this is the reply to DATA)
Are you sure that the replies are received in this order?
If that is the case, then the server mis-implements SMTP command
pipelining. To turn that feature off in Postfix:
/etc/postfix/main.cf:
smtp_discard_ehlo_keywords = pipelining
Do "postfix reload" and try again.
Wietse
