Authentication turned on in your email client

Hellorarely can not send emails to certain specific mail addresses.

and I get the following error:

Error transferring to COM.com; SMTP Protocol Returned a Permanent Error 550 Authentication turned on in your email client.

my server is the one that has the problem?

will be the server of another company that got the problem?

please do you help me?

thank you very much

Subject: Issue solved

Hi,

I had the same problem for a particular domain(ex.abc.com). I couldn’t get any solution for this issue from internet too. Finally, i did a trace from the server console to that domain (abc.com). The DNS lookup used by the server to send out mail returned a wrong IP address for the domain(i knew it’s wrong because it’s one of our client’s domain).

Please check the IP address of the domain and try to correct it in the DNS server Or add a local entry in the server machine’s host file.

(like xxx.xxx.xxx.xxx(mx entry IP address of the domain)abc.com)

Now try to route the mails to that domain. It should work.

I hope this will help you.

Thanks

John.

Subject: “SMTP Protocol Returned a Permanent Error 550 No such domain at this location”

These delivery failure messages are received when trying to relay mail through your Domino server with a firewall between the sending and receiving server?

If so, the reporting MTA of the delivery failure could be your firewall then verify that you are not configured to not allowing relaying. Changes needed to be made on the firewall to allow relaying.

Subject: thanks I have a cuestion

I have barracuda if I send email for hotmail.com and yahoo.com and xyz.com and gmail.comonly the problem is for xyz.com

What happen with barracuda?

thank you very much for your help

Subject: Any word on this?

I have the exact same issue. My smtp server is Domino 8, and we send mail through Sprint without any outbound relays.

Subject: Have you checked

Have you checked that you have an PTR record on you WAN IP Address?