SMTP Error 550

J

JeanetteR

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Yesterday and today still I receive this error message (delivery failure report) when I tried sending e-mails to a specific domain:


Hello #550 Bad CT IP Reputation - (reject) ##


Please could someone advise what I can do to fix this. Is my IP blacklisted or would the problem be with the recipient(s) SMTP servers? Could it be that my e-mails be rejected because of overfull inboxes?

Thanks for your help.:confused:
 
you can check it here.

http://www.senderbase.org/index

Make sure your smtp server is not spamming the world.
change passwords and check if mail is being Relayed through your server.

Which ISP you with?
you should use the ISP's SMTP server.
setup the ISP's SMTP as a smart host.
 
It seems like the IP address of the mail exchanger is listed with a blacklist. Do you relay through an ISP or directly? I see you listed the post under iBurst, are you using and iBurst connection?
 
<?php?> said:
It seems like the IP address of the mail exchanger is listed with a blacklist. Do you relay through an ISP or directly? I see you listed the post under iBurst, are you using and iBurst connection?
Click to expand...

Yes I am using iBurst connection on Outlook Express. No problems when I use my Hotmail account.
 
I too have been experiencing plenty of Blacklist problems during the past couple of weeks. Not with IBurst, but with Hetzner's shared servers.

You can use the following URL to see which Blacklist the specific IP address has bene flagged on:

http://mxtoolbox.com/blacklists.aspx

Then, what you need to do, is contact IBurst and tell them about the problem. Since they are the owners of the IP address, they will need to do the necessary with the relevant Blacklist owners to have their IP address or addresses removed.

In the mean time, what you need to do is find an alternative SMTP server to make use of. I'm not sure if it will work with a Hotmail account, but I have achieved this through GMail, so it may work.

In Outlook Express, change the Outgoing Mail Server (SMTP) from IBurst's to:
smtp.live.com
TLS Enabled
Port 587

Set SMTP Authentication to ON & use your Hotmail Username & Password as the required Username & Password.

While there are public SMTP servers, I am wary of using them as they may be harvesting information from outgoing e-mail sent through their servers. Not that Microsoft, Yahoo or Google aren't doing this in any case.
 
Anyone else come across this type of mail delivery failure recently?

SMTP error from remote mail server after RCPT TO:<[email protected]>:
host mail22.mimecast.co.za [41.74.197.22]: 550 Bad CT IP Reputation - (reject)
 
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