On 2/14/2011 9:36 AM, Georg Schönweger wrote:
Am 14.02.2011 15:21, schrieb Noel Jones:
On 2/14/2011 7:51 AM, Georg Schönweger wrote:
thx for your help. i can't check the DNS query on our relayhost smtp
server. On our local Server the MX is current. My conclusion is that a)
our external relayhost smtp has wrong MX entry or b) recipient
mailserver is misconfigured. I will switch off now the relayhost since
our ip isn't listet on any blacklist i checked so far..
Other question: I have a local postfix server with a dynamich IP which
sometimes is blacklisted. Does it help in this case to use a relayhost
which isn't blacklistet? Because the final-recipient's mailserver could
see/check that the original mailserver is blacklistet.
- Georg
You'll never get reliable delivery sending from a dynamic IP. You'll
need to use your ISP's relayhost.
Generally you should disable MX lookups on the relayhost by enclosing
the server name in [] brackets.
relayhost = [smtp.example.com]
-- Noel Jones
i had the relayhost enclosed in brackets. So if it is in brackets does
this mean that only my server will do the mx lookup (not the one set as
relayhost)? If this is true then it would be sure that there is a
misconfiguration on recipients mail server.
- Georg
When the hotname is enclosed in [brackets], MX lookups are NOT
done. Postfix uses the A record of the named host.
This duplicates what desktop mail clients do with an "smtp
gateway". Be careful you're not overriding the relayhost
with a transport_maps entry.
http://www.postfix.org/postconf.5.html#relayhost
