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What does "dynamic/dialup IP refused" error mean?


Example:
From: test@somedomain.com
To: info@justonedomain.com (email address on 1&1 Mail Servers)

test@somedomain.com tries to send an e-mail to info@justonedomain.com but receives the following error:


Recipient address: info@justonedomain.com
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550 rejected because of RBL: direct deliveries from this
dynamic/dialup IP refused, use your ISP's smarthost.
Remote system: dns;mx00.1and1.com (TCP|10.23.32.21|56202|217.160.230.12|25)

This means that the IP(10.23.32.21) address test@somedomain.com is trying to send
e-mail through is listed as a dial up dynamic IP.

Normally if somebody was on an Internet connection and sends an e-mail they would
use an e-mail server like smtp.isp.com. This e-mail server (smtp.isp.com) then makes
a connection to the MX server of 1&1. Now 1&1 server takes the e-mail.

So basically you should use one mail server to connect to another mail server.

But when you receive the above error it means, that test@somedomain.com is directly
trying to connect to 1&1 mail server from an IP without using a mail server.

1&1 does not allow dynamic IP address connections. This is to prevent spam.


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