Hi Benoit


Be Careful mxbw.lb.bluewin.ch seems to be an entry wich is load balanced with different A Records .
I've got a different IP after the TTL expired. So you are ending up on different server on the bluewin site.

maybe a server in the cluster which has a specific problem, just a guess.

Try telnet to the different server and if you can find the specific server -> then try to contact the mailmaster :-)

On 24.01.2019 13:54, Benoit Panizzon wrote:

Dear List

Has anyone else experienced this problem? According to our customer, it
occurred a couple of times in the last days:

Sender and Destinations are the same in all examples:

Our customer is sending an email to bluewin:

Jan 23 13:32:42 obelix postfix-submit.obelix/smtp[28721 C5015C0CE5: to=<****@bluewin.ch>, relay=mxbw.lb.bluewin.ch[]:25, delay=57, delays=1.6/0.01/44/11, dsn=2.0.0, status=sent (250 2.0.0 mHh5gTobfzOqbmHhngLDSm mail accepted for delivery)

Bluewin Customer replies:

Jan 23 17:10:17 obelix milter-greylist: (unknown id): skipping greylist because address is in DNSRBL, (from=<****@bluewin.ch>, rcpt=<****@breitband.ch>, addr=vimdzmsp-sfwd03.bluewin.ch[]) ACL 196

Our customer replies:

Jan 23 17:24:38 obelix postfix-submit.obelix/smtp[12583 D0AE7C10EE: to=<****@bluewin.ch>, relay=mxbw.lb.bluewin.ch[]:25, delay=101, delays=0.27/0.01/66/35, dsn=5.1.1, status=bounced (host mxbw.lb.bluewin.ch[] said: 550 5.1.1 <*****@bluewin.ch> recipient rejected, address unknown (in reply to RCPT TO command))

Same IP Address of same bluewin server as before, not replies the
destination does not exist. I can assure you, it is the same address as

Our customer tries again:

Jan 23 17:32:23 obelix postfix-submit.obelix/smtp[26676 C9470C1271: to=<*****@bluewin.ch>, relay=mxbw.lb.bluewin.ch[]:25, delay=3, delays=0.24/0.02/0.59/2.1, dsn=2.0.0, status=sent (250 2.0.0 mJApg3d9Gp4S3mJAqgsUex mail accepted for delivery)

Now the email is getting through!

Mit freundlichen Grüssen

-Benoît Panizzon-