On 2011-10-19 16:03, eu...@mail2.infochem.de wrote:
> For some strange reason the party on the other end suddenly
> no longer can send mail to us (delivery *from* us succeeds),
> claims that cert chain is in the wrong order.
>
> How can I verify this, for StartTLS? The server is this
> one (mail2.infochem.de).

Hi,

you can check SMTP over TLS certificate using openssl:
`openssl s_client -connect mail2.infochem.de:25 -starttls smtp`

In this case certificate is not signed by Thawte, but it's self-signed. Check if smtpd_tls_cert_file and smtpd_tls_key_file options are pointing to the correct certificate/key.

Best Regards
--
Kamil Raczynski

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