Mailbox unavailable
The typical error report for the "Mailbox unavailable" error looks like this:
Delivering via flmx-2.tampabay.rr.com:25
< 220 flmx06.mgw.rr.com ESMTP Welcome to Road Runner. NO UCE *** FOR AUTHORIZED
USE ONLY! ***
> HELO 242852hfc04.tampabay.res.rr.com
< 250 flmx06.mgw.rr.com Hello 242852hfc04.tampabay.res.rr.com [24.28.52.4],
pleased to meet you
> MAIL FROM:<xxxx@tampabay.rr.com>
< 550 5.7.1 Mail Refused - res.rr.com - See http://security.rr.com/rrDynamic.htm
The explanation of the failure to deliver the message is in the last string (please
follow the url above). The mail has been rejected because the mail server does not accept
mail from dynamic IP addresses. To bypass this restriction, you should send
mail to these addresses via your ISP's SMTP server. Please open the
Settings/ISP Troubleshooting menu in Atomic Mail Sender and specify the mail server
address there (see the screenshot below). It should help.
(Usually, you should not select "ESMTP Authentication" and "POP
before SMTP". It is required only if your ISP requests authentication before
sending mail.)

See also other error types:
How to get the full version of Atomic Mail Sender
To order Atomic Mail Sender, simply click the link below or go to this
section to learn more about alternative payment methods. Also, before ordering,
you can get the downloadable version of the program here.
Buy
the full version of Atomic Mail Sender for $99.85 on-line
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