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Can't Send welcome mail. AuthenticationInvalidCredentials: 5.7.0 Denied

Discussion in '3CX Phone System - General' started by sunrise, Feb 22, 2018.

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  1. sunrise

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    My 3cx can't send Email. When I tested "SMTP server 3cx" have error: AuthenticationInvalidCredentials: 5.7.0 Denied

    Then I change update server to https://downloads-global.3cx.com/downloads/v155
    But problem not solved.
    I use Free version and now can't change SMTP to another

    Logs:
    2018/02/22 02:55:03.612|2112|0021|Excpt|MailKit.Security.AuthenticationException: AuthenticationInvalidCredentials: 5.7.0 Denied
    в MailKit.Net.Smtp.SmtpClient.Authenticate(Encoding encoding, ICredentials credentials, CancellationToken cancellationToken)
    в MailKit.MailService.Authenticate(String userName, String password, CancellationToken cancellationToken)
    в GenericUtilsNet.MailTemplateSender.Send(XDocument template, Func`2 getParameter, String mailTo, IEnumerable`1 attachments)
    в _3cxSystemService.ExtSheduller.WelcomeEmailSender.SendWelcome(Extension ext)
    в _3cxSystemService.ExtSheduller.WelcomeEmailSender.SendingProc()
     
  2. StefanW

    StefanW Head of Customer Support and Training
    Staff Member 3CX Support

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    5.7.0 is a missmatch of your FQDN IP to the IP you are sending the eMail from. Check under Settings Network that the IP there is correct and your FQDN resolves accordingly.
     
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  3. sunrise

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    What should I do if the Crimea is currently under sanctions and without VPN I can not update and send E-mail. But when connect via VPN, this error appears.
     
  4. StefanW

    StefanW Head of Customer Support and Training
    Staff Member 3CX Support

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    you might set as public IP the VPN endpoints IP. Dependently if you have remote connected devices using the FQDN, then this would work.
     
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