smtp

  1. Karl Malone

    3CX Not Sending Voicemail Emails for One Extension

    Hello, We have an issue with 3CX failing to send voicemail emails for a particular extension on a phone system we manage. We've confirmed that the extension has new voicemails, but no email notifications were sent for about a full day. We are using a third-party SMTP service, which is working...

  2. Whitelisting 3CX voicemail server

    The last 2 days, I have found my hosted email service blocking 3CX voicemail delivery. What is the best address to whitelist to avoid this from happening? This happened several years ago, was corrected by my email host and is recurring for some strange reason.
    • biggreyphone
    • Thread
    • smtp voicemail whitelist
    • Replies: 7
    • Forum: SMB

  3. Emails Not Sent to Specific Email Address

    Hi All, We have a client running 3CX Enterprise v18.0 (Build 20) in AWS (Debian 9). They reported that welcome emails sent to one extension were never received by the associated email address. I performed a message trace and found no messages from 3CX delivered to the end user's Microsoft 365...

  4. 3CX SMTP Issue

    My 3CX is AWS hosted, and seems to be working properly, excpt for some 3CX SMTP issues. I have email alerts set to go to my alert email address, and Verizon email to text. I receive the alerts via the "real" email address, but not on the [email protected]. Any thoughts?

  5. SMTP status page

    Hi, I was wondering if there was an statuspage for the 3CX SMTP server.

  6. SMTP Error

    3CX is no longer able to send voicemails through our internal SMTP server. When I click on test I get the below error message: MailKit.Net.Smtp.SmtpCommandException: 5.7.1 Unable to relay for at MailKit.Net.Smtp.SmtpClient.OnRecipientNotAccepted(MimeMessage message, MailboxAddress mailbox...
  7. jasonhille

    3CX SMTP - Office365 Encrypted Outgoing Emails

    We are attempting to test Office365 SMTP configurations. We've configured an Office365 user/email account (in Azure) and have set a rule to have any emails sent using this account be automatically encrypted for top level security. As 3CX doesn't have an integration for 2FA/MFA with O365 , an app...

  8. Outbound SMTP not working

    Hello, I am in need of some assistance/clarification. I am in the process of looking at changing where we are hosting out 3CX tenancies to Microsoft Azure. I have migrated my test tenancy across and its all working fine except i cant send emails. I am using a custom SMTP server. This license...

  9. Solved 3CX Custom SMTP Server stops working

    Wondering if anyone else had their voicemail-to-email suddenly stop working and spend a couple hours scratching their head over why, only to eventually give up and switch to the 3CX SMTP server? This has happened on at least 3 different servers now (15.5). https://www.3cx.com/docs/manual/ seems...

  10. Email notifications not working

    Hey guys, I have a client on 15.5 SP6 that has an inhouse 2016 exchange server running on server 2012 R2. Over the weekend the emails stopped sending from the system. THey noticed that the reports they get every day are no longer coming to them. After doing some digging I found that when I test...

  11. Welcome Mails don't send - SMTP Test OK

    Hello everybody. Our customer has 3CX V15.5 on Debian and uses the 3CX-SMTP Server. When sending a testmail from the settings, the mail is sent and recieved without problems. Also mails regarding missed calls are being sent and recieved. Only welcome-emails don't get recieved - how can I check...

  12. The SMTP server does not support authentication.

    Hello, I have the same problem from this thread: https://www.3cx.com/community/threads/the-smtp-server-does-not-support-authentication.58684/ I wonder if you find any solution ? The problem is I receive the error <<The SMTP server does not support authentication.>> either with Gmail, Office...

  13. Can't configure custom smtp on OVH - Entreprise licence

    Hey guys, We just bought an enterprise licence and im running on from OVH. I can't set-up my custom SMTP server, it gives me a timeout error on port 25 and a very long error when i activate SSL: MailKit.Net.Smtp.SmtpCommandException: 5.7.1 Mail from 66.70.186.206 has been blocked by Trend...
  14. AustinM95

    Unable to use a SMTP server other than 3CX's

    OS: Windows 10 Professional License: Standard Annual 15.5 I'm unable to use the dropdown option to select my own SMTP server. It's grayed out. (See Picture). This would be fine if the 3CX SMTP server worked. When I press TEST I receive the error "AuthenticationInvalidCredentials 5.7.0 Denied"...
  15. sunrise

    Can't Send welcome mail. AuthenticationInvalidCredentials: 5.7.0 Denied

    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...
  16. sip.bg

    3CX SMTP server returns: AthenticationInvalidCredentials: 5.7.0 Denied error

    Newly installed 3CX standard instance. Testing email server returns: AthenticationInvalidCredentials: 5.7.0 Denied error. Any clue ?

  17. 3CX SMTP Server problem to change server type

    I'm on a 3CX ISO Debian server. From November at the new release of the 3CX, my SMTP personal doesn't work more. On the Settings / Email, I have only "3CX SMTP server" and I can't change that. Can I change that?
  18. mukkacow

    SMTP problems (fastmail.com

    Hello, I'm trying to set SMTP for outgoing e-mail. My e-mail provider is fastmail.com. I have tried every port they have in settings but noway to get it working (21,25,80,587,465,443). I have found this post: It's confirmed that for Google hosted PBX we can't use external smtp on these ports ...

  19. Email-Adress - SMTP not working

    Hi, I have 3CX installed as cloud version on AWS. In the settings I want to change the email address from which configurations and invitations should be sent to our Kopano server running on UCS with postfix. Our mail server has port 465 open so I set the server to our.email.server:465 put in...

  20. Solved New Setup PBX express on cloud welcome mail not been sent

    Hello all I have just installed PBX express on google cloud.While installing I entered my SMTP details and and tested it showed fine and sent me a mail,but after login to management console if I try sending welcome email after selecting any of extension the same is not getting delivered.Even in...
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