asked on

Exchange 2010 refused connection from sender

Dear Expert,

I have a customer that cant send email to us recently, the log they provided state below,

2013-12-24 17:29:22,OUTBOUND,jmchen@efgh.com.tw<mailto:jmchen@efgh.com.tw>(172.21.36.135),joyce@abc,com<mailto:joyce@abc,com>(101.99.x.x-mail.abc,com<http://101.99.x.x-mail.abc,com>),967613063,22545,QUEUED,601,Deferred: Connection refused by mail.abc,com<http://mail.abc,com>
2013-12-24 17:29:22,OUTBOUND,miahsieh@efgh.com.tw<mailto:miahsieh@efgh.com.tw>(172.21.36.135),joyce@abc,com<mailto:joyce@abc,com>(101.99.x.x-mail.abc,com<http://101.99.x.x-mail.abc,com>),513374723,53521,QUEUED,601,Deferred: Connection refused by mail.abc,com<http://mail.abc,com>
2013-12-24 17:29:22,OUTBOUND,jmchen@efgh.com.tw<mailto:jmchen@efgh.com.tw>(172.21.36.135),joyce@abc,com<mailto:joyce@abc,com>(101.99.x.x-mail.abc,com<http://101.99.x.x-mail.abc,com>),914463265,13973,QUEUED,601,Deferred: Connection refused by mail.abc,com<http://mail.abc,com>
2013-12-24 17:29:22,OUTBOUND,miahsieh@efgh.com.tw<mailto:miahsieh@efgh.com.tw>(172.21.36.135),joyce@abc,com<mailto:joyce@abc,com>(101.99.x.x-mail.abc,com<http://101.99.x.x-mail.abc,com>),1285071653,25209,QUEUED,601,Deferred: Connection refused by mail.abc,com<http://mail.abc.com>

I did check their domain name, the spf and reversed dns is not found.

could it be the cause?

remarks: only this customer is having problem to send email to us

Thanks
Alfred

dsnegi_25dec

Yes ...........

SOLUTION

vSolutionsIT

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Mahesh

Yes, VSolutionIT is right..

Your Email server must be configured to check \ verify Sender's SPF record and if they don't have or got blacklisted, emails sent by them will be rejected by your server

Mahesh

Pradeep VIshwakarma

You must request a REVERSE DNS ENTRY from your ISP who issued the block of IP ADDRESSES.

The NAME and IP ADDRESS to which is mapped MUST EXACTLY MATCH THE HOSTNAME OF THE MAIL SERVER SENDING THE E-MAIL.

If you use one IP ADDRESS to send for multiple domains, make certain the mapping matches the domain name of your HOSTING COMPANY and the setup a PTR RECORD for each hosted domain in the DNS for the hosted domain.

You should also set up REVERSE DNS on your local DNS SERVERS and create a PTR record for each of the hosted domain's HOST records which maps to the MX record for the e-mail.

ASKER CERTIFIED SOLUTION

Marcus Bointon

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patcheah

ASKER

Thanks experts.

Request sender to add spf record. So far so good now. Happy New Year!