Exchange Message Reject 5.4.7

i have one user from a@abc.com domain trying to send email to b@xyz.com domain.
when user in a@abc.com domain trys to send email to b@xyz.com he gets the following error:

the email system was unable to deliver the message, but did not report a specific reason. Check the address and try again. if it still fails, contact your system administrator.
<4-SQH-IPX01.abc.xxxx.com #5.0.0. smtp: 5.4.7 - Delivery expired (message too old) '{Errno 0} Error' (delivery attempt: 0)>

i managed domain b@xyz.com (receiving end) i am trying to figure out if it's our problem or their problem.

i already did the following tests:
telnet mail.abc.com
helo xyx.com
mail from: b@xyx.com
rcpt to: a@abc.com (at this point i received error - 5.1.0 address rejected)

thanks in advance

j alfredo
LVL 1
jts2020Asked:
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BawerConnect With a Mentor Commented:
this happens almost in every organization and the only cause is the receiver has firewall or filtering software, just contact the receiver to check if any filtering software they deployed.
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jts2020Author Commented:
I am the IT for the receiver server and I already added
1. The individual email address of the sender to the allowed senders in the Vipre Email Security globally)
2. I added their mail server ip addresses to my allowed list

I have disable/turn off the Microsoft Intelligent Messaging filter.

Anything else I can check on my end?

Thanks
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BawerCommented:
Both the options are OK, just also add the domain xyz.com to the list of allowed domains and then check.
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Alan HardistyCo-OwnerCommented:
Please check the sending server is RFC compliant, is not blacklisted and has Reverse DNS configured correctly and it's FQDN is correct by reading my article:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/A_2427-Problems-sending-mail-to-one-or-more-external-domains.html
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AmitConnect With a Mentor IT ArchitectCommented:
Delivery time-out.  Message is taking too long to be delivered. Check rec connector settings. Make sure you don't have underscore.
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jts2020Author Commented:
i did many tests and the one that stood out was under mxtoolbox.com.
the transaction time came up with: 15.584 - Not Good! on Transaction time.

how could i fix that?
is it my router/firewall (netgear FVS336G) or my SBS2003?

thanks,

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Alan HardistyCo-OwnerCommented:
That's not one I would be worrying too much about.

With Netgear - make sure you have the latest firmware installed.  They often bring out new ones to fix bugs, so check and upgrade if a new version is available.
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jts2020Author Commented:
after doing many test emails from about 20 domains i managed, i noticed i could not send from 3 domains to my abc.com domain.
some of the errors bounce back were:
#<#4.4.7 SMTP; 403 4.7.0 TLS handshake failed> #SMTP#
Double checked my settings in my SMTP Virtual Server Connector and notice that Secure Communication was on and a certificate was installed.
After deleting/clearing the certificate mail started flowing from all domains i couldn't received mail.
Not sure how that setting magically turn on - but i do shared control with another IT Company some server management duties (but this was my area).

thanks everyone for helping

j alfredo
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jts2020Author Commented:
found partial solution here and rest of solution found searching online.
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