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gbalbach

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Hello everyone,

I am looking for some tips here - whenever we email anyone with a verizon.net address we get the follow message back from Kerio in the logs then the message eventually fails:

Result: delayed, Status: 4.1.8 450 Requested mail action not taken-Try later:sv27pub.verizon.net

Any ideas?
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freakinvibe

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This extended error number is normally

451 4.1.8 Domain of sender address does not resolve

Do you have a proper MX record for your sender address? Do you have a valid PTR address?

Regards, Pascal

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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gbalbach

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Yes I have a valid MX and PTR record, and it isn't error 451, it is 450.
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gbalbach

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Looks like we got it working, I found some info posted in another forum from Verizon's tech folks:

A few tips:

1.) Please ensure that your server is accepting mail from
206.46.252.0/24.

2.) Please ensure that your server accepts a Null Mail From: command
e.g. Mail From:<>.

3.) Please ensure your mail server responds to the SMTP commands within
30 seconds.

4.) Please ensure the from address used is a valid email address that is
accepted by the MX server for that domain.

5.) Please ensure you have a proper MX record.

If you are still having issues please double check the IP address you
submitted and if an error is found you can resubmit the request via the
web form at http://www.verizon.net/whitelist or
whitelist<.a.t.>verizononline.net email address for further investigation.

For my fix it was #1 on the list.
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