Hello to everyone!

Since one week we have a big problem to send emails to gmail.com adresses. Every other domain works as receiver of the mails.
We use Groupwise 14.2.2.1.

I have checked, if we are blacklisted on mxtoolbox.com. We are not blacklisted.

The logfile looks like this:

09:23:58 6624 DMN: MSG 635620 Attempting to connect to gmail-smtp-in.l.google.com
09:23:58 6624 DMN: MSG 635620 Connected to [74.125.133.27] (gmail-smtp-in.l.google.com)
09:23:58 6624 DMN: MSG 635620 Send Failure: 550 5.7.1 information. h24si8690157wrb.185 - gsmtp
09:23:58 6624 DMN: MSG 635620 SMTP session ended: [74.125.133.27] (gmail-smtp-in.l.google.com)
09:24:08 706C MSG 635620 Analyzing result file: /grpwise/novell/gwlbs/wpgate/gwia/result/r9cb6e2e.764
09:24:08 706C MSG 635620 Command: gmail.com
09:24:08 706C MSG 635620 Response: 220 mx.google.com ESMTP h24si8690157wrb.185 - gsmtp
09:24:08 706C MSG 635620 Command: EHLO mail.lbs-voitsberg.ac.at
09:24:08 706C MSG 635620 Response: 250 ok
09:24:08 706C MSG 635620 Command: MAIL FROM:<sender.email@lbs-voitsberg.ac.at>
09:24:08 706C MSG 635620 Response: 250 2.1.0 OK h24si8690157wrb.185 - gsmtp
09:24:08 706C MSG 635620 Command: RCPT TO:<recipient.email@gmail.com>
09:24:08 706C MSG 635620 Response: 250 2.1.5 OK h24si8690157wrb.185 - gsmtp
09:24:08 706C MSG 635620 Command: DATA
09:24:08 706C MSG 635620 Response: 354 Go ahead h24si8690157wrb.185 - gsmtp
09:24:08 706C MSG 635620 Detected error on SMTP command
09:24:08 706C MSG 635620 Command: Data...
09:24:08 706C MSG 635620 Response: 550 5.7.1 information. h24si8690157wrb.185 - gsmtp

09:24:08 706C Building undeliverable message

I have no idea what's going wrong? The same configuration works since years.

Do you have any ideas?

Best regards
Manfred