Blackberry mx servers blacklist of postfix server ?

Hello,
We are unable from one of our servers to send mail to blackberry mailbox.
We have this from postfix log :
Jul 28 16:41:32 toto postfix/qmgr[22971]: 070762300F: to=<****@***.blackberry.com>, relay=none, delay=240528, delays=240526/1.5/0/0, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx03.bis.eu.blackberry.com[216.9.253.34] while receiving the initial server greeting)
We have also this message from all blackberry mx servers.
We have test connection with a telenet on the port 25, but the connection is closing instantly :
$ telnet mx04.bis.eu.blackberry.com 25
Trying 216.9.253.35...
Connected to mx04.bis.eu.blackberry.com.
Escape character is '^]'.
Connection closed by foreign host.
$
We have not this problem from other servers and this problem appeared since a few days.
Do you think there can be a blacklist of smtp servers which are sending mail to bb mailbox ?
Any help will be greatly apperciate.
Regards,
Nicolas

BIS maintains its blacklist of IP address and domains based on industry standards. If your IP and domain ratings have gone bad on anti-spam monitoring websites, and as soon as those ratings are back to normal you should be able to send mail to BB address.
Click on KUDOS to appreciate our efforts and mark the thread RESOLVED if your issue is resolved.

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