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ITAdmin-1327 avatar image
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ITAdmin-1327 asked AndyDavid commented

451 4.4.0 primary target ip address responded with 421 4.4.1 connection timed out for single domain

Hi.,
Unable to send mails to specific domain, mails stored in queue in exchnage server 2007

451 4.4.0 primary target ip address responded with 421 4.4.1 connection timed out. Attempted failver to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to alternate hosts.

Action taken :

  1. Ip was blacklisted and spoke to isp and cleared.

  2. Mx record found

  3. SPF found

  4. DKIM Found

Unable to send emails to only specific domain and able to receive mails.



office-exchange-server-mailflow
5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

AndyDavid avatar image
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AndyDavid answered AndyDavid commented

Some of those I cant connect to:

I would set it to only the mx records that have a weight of 10

123.136.22.36
123.136.22.38
123.136.16.36
123.136.16.38

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5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

I had added the specified ip addresses, should i check " use the external dns lookup settings on the transport server " ?

Left blank ( not checked ), Address space mentioned as " * " & Cost 10.

Kindly correct me, if any settings are wrong.

Still on queue..

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If the IPs are used then no, no need to use DNS :)


the Address Space has to be the domain you are trying to send to:

yesbank.in

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Thankyou Andy,
Issue resolved :)..!! No mails in queue. Can i know the reason for non-deliverable issue ?

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AndyDavid avatar image
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AndyDavid answered ITAdmin-1327 commented

Create a send connector for just that domain and set to the smarthost to whatever is set in their MX record. then send a test message and see if it goes through.

(2007 is way out of support! )

· 5
5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

Hi Andy,
Tried adding send connector with domain and smarthost created according to Mx record and found the same problem persists

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whats the domain you are trying to send to?

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Domain name is yesbank.in and we are able to receive mail and reply also struck in queue.

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