Author Topic: Error Outlook: 450 4.7.1 Client host rejected  (Read 1964 times)

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Error Outlook: 450 4.7.1 Client host rejected
« on: January 02, 2017, 05:37:15 PM »
Hello, I have problems to send mails from the client Outlook returns the error 450 4.7.1 Client host rejected: can not find your hostname, while if I send it from WebMail it works.
As I read it may be a Postfix configuration, any suggestions?
Thanks.

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Re: Error Outlook: 450 4.7.1 Client host rejected
« Reply #1 on: January 02, 2017, 07:15:00 PM »
Check if your revdns is correct.

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Re: Error Outlook: 450 4.7.1 Client host rejected
« Reply #2 on: January 02, 2017, 08:39:53 PM »
In MXToolBox  says:

SMTP Reverse DNS Mismatch

Then it can be the problem?
In the vps where can I check it?

Thanks!

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Re: Error Outlook: 450 4.7.1 Client host rejected
« Reply #3 on: January 13, 2017, 06:46:16 PM »
Hi, the rdns is already correctly configured, what I find that maybe this is not well configured is in MailServer Manager, where it says hostaname I have host.domain.com and the domain is .com

Do I have to change the domain? domain.com and Rebuild Mail Server?

Thanks

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Re: Error Outlook: 450 4.7.1 Client host rejected
« Reply #4 on: January 13, 2017, 07:10:58 PM »
Hello, this problem was solved, it was not a problem of Vps but of the DNS

Thanks

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Re: Error Outlook: 450 4.7.1 Client host rejected
« Reply #5 on: January 16, 2017, 12:22:09 PM »
Sorry the previous message corresponds to another topic.

This is where I stay

Hi, the rdns is already correctly configured, what I find that maybe this is not well configured in MailServer Manager, where it says hostaname I have host.domain.com and the domain is .com

Do I have to change the domain? Domain.com and Rebuild Mail Server?

Thanks

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Re: Error Outlook: 450 4.7.1 Client host rejected
« Reply #6 on: January 18, 2017, 02:32:53 PM »
Hello, I have problems to send mails from the client Outlook returns the error 450 4.7.1 Client host rejected: can not find your hostname, while if I send it from WebMail it works.
As I read it may be a Postfix configuration, any suggestions?
Thanks.

You miss configure outlook setting.. 
To make outlook able send email through your server, must enable smtp authentication in outlook..