We currently route our mail through Postini. Their provider claims they haven't blocked our domain, but being that we use Postini they maybe blocking that IP range as opposed to our domain.
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Question
Exchange Mail Delivery Issue - MSExchangeTransport
Exchange 2003 SP2
Can anyone explain what the following error in my exchange app log is caused by?
Event ID: 7004 Source: MSExchangeTransport
This is an SMTP protocol error log for virtual server ID 1, connection #1657. The remote host "64.18.7.12", responded to the SMTP command "rcpt" with "550 MTA inaccessible for too long for domain:reputationsuk.com - psmtp ". The full command sent was "RCPT TO:@reputationsuk.com> ". This will probably cause the connection to fail.
This is the only reciepient I'm having email delivery issues with. Maybe they are blocking our domain on their side? I've checked my domain and we are not on any Blacklists......
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Answers
you can enable message tracking
send a few test emails to this domain and see if it gets by postini on the tracking tool which i think this will show(not 100% certain)
it will probably come up with something like "transferred to postini"
setting up an smtp connecter could be another option for this domain only
The Maximum Transmission Unit (MTU) is the largest size of IP datagram which may be transferred using a specific data link connection The MTU value is a design parameter of a LAN and is a mutually agreed value (i.e. both ends of a link agree to use the same specific value) for most WAN links. The size of MTU may vary greatly between different links (e.g. typically from 128 B up to 10 kB)..
if the mtu size is too high with regard to email the recieving server can time out and cause a bounced response. lowering the mtu will reduce the packet size and limit the amount of data transfered in the shortest possible time. I have seen this happen with older antispam solutions.
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by: poweruser32Posted on 2007-02-22 at 06:58:18ID: 18588032
its not an exchange eror message but is is caused by external firewall or anti spam software i would say
are you sending email thru your isp?
i would try contact the other domain first and check with them