IP is static and entered commands/text is the same too. No mistakes, i was carefully checking all commands and entered text.
And as i found most problematic smtp is windows based MailEnable.
What else i should check?

Rogier Krieger wrote:
On 6/4/07, Edgars Makra <[EMAIL PROTECTED]> wrote:
With one such non passable smtp server admin we tested it via phone. He
said that promt is very slow (as it should be), then he got 451 Temp
error. After 5, 15, 30 and 60 minutes he retried, nothing :(

If you tried connecting by manually performing an SMTP conversation,
be sure to connect from a constant IP address and be especially
careful to send exactly the same information for the MAIL FROM and
RCPT TO commands. A simple typo can mess up your test and explain your
problem.

To prevent typing mistakes, you may want to consider scripting a test,
e.g. by using nc(1) and a constant SMTP conversation. Be sure to make
it a proper SMTP conversation, too, given Bob Beck's remark earlier in
this thread.

Hope this helps,

Rogier

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