Print Page - Test Message from outlook fails: The server responded: 450 4.7.1 Client host rej

Title: Test Message from outlook fails: The server responded: 450 4.7.1 Client host rej
Post by: expansity on June 10, 2019, 12:06:55 PM

Hi guys,

Everything works sending messages from/to webmail.

I try setting up my mail account in Outlook with the above error.

Please assist

Title: Re: Test Message from outlook fails: The server responded: 450 4.7.1 Client host rej
Post by: adamjedgar on June 10, 2019, 08:59:02 PM

Can you post the full error message...the crucial part for someone to help problem solve this is missing..

What does the message say after "reg"?

Is it something like " rejected: unverified address " ?

Title: Re: Test Message from outlook fails: The server responded: 450 4.7.1 Client host rej
Post by: expansity on June 11, 2019, 05:02:14 PM

See error:

Server error: '450 4.7.1 Client host rejected: cannot find your hostname, [x.x.x.x]'

Title: Re: Test Message from outlook fails: The server responded: 450 4.7.1 Client host rej
Post by: expansity on June 13, 2019, 04:30:29 AM

For those having same error, I solved my issue as follows:
1. When rebuilding Postfix Configuration, only tick: ClamAV, Amavis & Spamassassin, AND Install DKIM & SPF
2. Restart all mail server services

I can now send and receive emails from Outlook.

Title: Re: Test Message from outlook fails: The server responded: 450 4.7.1 Client host rej
Post by: evansa on June 13, 2019, 07:19:43 AM

also ask IP provider to create rdns/PTR to resolve from your IP to your server hostname

Control Web Panel

WebPanel => E-Mail => Topic started by: expansity on June 10, 2019, 12:06:55 PM