Re: Weird Bluewin Server Problem (occasional 550 5.1.1)

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[195.186.120.50]: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 195.186.120.132 is in DNSRBL, (from=<****@bluewin.ch>, rcpt=<****@breitband.ch>, addr=vimdzmsp-sfwd03.bluewin.ch[195.186.120.132]) 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[195.186.120.50]:25, delay=101, delays=0.27/0.01/66/35, dsn=5.1.1, status=bounced (host mxbw.lb.bluewin.ch[195.186.120.50] 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
> before.
> 
> Our customer tries again:
> 
> Jan 23 17:32:23 obelix postfix-submit.obelix/smtp[26676 C9470C1271: to=<*****@bluewin.ch>, relay=mxbw.lb.bluewin.ch[195.186.227.50]: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-


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