On Wed, Sep 11, 2013 at 10:19:19AM +0200, Ralf Hildebrandt wrote:
> Sep 11 09:21:22 mail2 postfix/cleanup[23372]: 3cZZKZ2WvdzBt9C: 
> message-id=<f0cdc3dbf712aa448525e5dddc62b6f4039fe69d4...@exchange31.charite.de>
> Sep 11 09:21:22 mail2 postfix/qmgr[10759]: 3cZZKZ2WvdzBt9C: 
> from=<sen...@charite.de>, size=36991, nrcpt=1 (queue active)
> Sep 11 09:31:23 mail2 postfix/smtp[22134]: 3cZZKZ2WvdzBt9C: conversation with 
> mail.vivantes.de[62.220.2.98] timed out while sending end of data -- message 
> may be sent more than once
> Sep 11 09:31:23 mail2 postfix/smtp[22134]: 3cZZKZ2WvdzBt9C: 
> to=<recipi...@vivantes.de>, relay=mail1.vivantes.de[62.220.2.99]:25, 
> delay=601, delays=0.01/0/601/0.55, dsn=2.0.0, status=sent (250 2.0.0 
> r8B7VMsm013069 Message accepted for delivery)
> Sep 11 09:31:23 mail2 postfix/qmgr[10759]: 3cZZKZ2WvdzBt9C: removed
> 
> It seems the first delivery fails (after 10 minutes), and the
> subsequent retry succeeds immediately. It strikes me as odd that the
> mail is being retried in the very second the error message ist being
> logged.

The message was immediately accepted by the second MX host for 
vivantes.de after the first MX host timed out.

Paul.

-- 
Paul Hoffman <p...@flo.org>
Systems Librarian
Fenway Libraries Online
c/o Wentworth Institute of Technology
550 Huntington Ave.
Boston, MA 02115
(617) 442-2384 (FLO main number)

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