smtp.saix.net rejecting mail from qmail

[sjoelk]

Greetings!
I have qmail behind a firewall with :smtp.saix.net in smtproutes.
All mail bounce with the following error:
196.25.240.94 said: 550 Error: 550 Sending junk to Postmaster Ref:95
It worked fine on saturday, but monday morning nothing went through!
Have already tried the following:
maildirserial: same problem.
Different adsl ips accounts: telkom, mweb, lantic.
No smtproutes: 165.165.0.0/16 is blacklisted by MANY servers, so it is not reliable.

Any ideas[?]

 

[zipper]

I had problems with SMTP some time ago. Send mail fails (from Mozilla, Netscape and OE). After doing some research i changed MTU size to 1300 (From 1384) and that fixed the problem. I also later found a different smtp server (smtp.dsl.telkomsa.net) that seems to fix the problem without changing the MTU.

 

[kobie]

ta for the help zipper was having the same problem with telkoms smtp servers.