Error '503 This mail server requires authentication'

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Ada
Posts: 3
Joined: Mon Dec 06, 2021 3:30 am

Error '503 This mail server requires authentication'

Post by Ada »

Dear Supporting team,
I am using Windows server 2016 and MailEnable Professional Edition (version 10.39). I can send and receive email in this Windows server 2016 system, but when I use another Windows system which connect with Thunderbird to send email with IMAP. It has This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server. Please refer to the attached image, I have set the port 25 open in Firewall. Could you help me to solve the problem?
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MailEnable-Ian
Site Admin
Posts: 9738
Joined: Mon Mar 22, 2004 4:44 am
Location: Melbourne, Victoria, Australia

Re: Error '503 This mail server requires authentication'

Post by MailEnable-Ian »

Hi,

Please see: https://www.mailenable.com/kb/content/article.asp?ID=ME020135
Regards,

Ian Margarone
MailEnable Support

Ada
Posts: 3
Joined: Mon Dec 06, 2021 3:30 am

Re: Error '503 This mail server requires authentication'

Post by Ada »

Dear Supporting team,
I would like to inform you that I have used a tool to test mail server is open for relay. The result is fine (Please refer to attached image), but when I tried to connect the mailenable with Thunderbird, it still had problem
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