Solved Voicemail e-mails and service e-mails not being received

[it-department@sogimsyndic]

We noticed that as from March the 1st, 2022 we do not receive any emails (voicemail e-mails and all maintenance e-mails) anymore coming from our 3CX instance (hosted on OVH). Emails sent by our 3CX PBX are using SMTP server of 3CX (3cx.net). We have several email addresses but all with same domain.

We think that our destination email domain name as been blacklisted by the SMTP server of 3CX because on that date on March the 1st, we had a problem with the capacity on our email server. It was no more possible to sent or receive any email from our email server due to that capacity limit problem. We solved the problem in the evening of that day. In the maintime the 3CX PBX was continuing sending emails.

We have checked all possible logs on our 3CX instance and we have no error messages when sending test emails (the logs are normal, the emails are simply sent). But even test emails are not sent (not received).

Would it be possible to check the 3CX SMTP bounce list and verify if our domain name is blacklisted ? Must we give our domain name on the forum ?

Thanks a lot in advance for any help.

 

[it-department@sogimsyndic]

Some more information :
We tested with an email address on other domain, and emails are sent. So we think that our regular domain name is on the 3CX SMTP bounce list.

 

[VasilisV_3CX]

Hi @it-department@sogimsyndic,

As you've already PM'd me, can you provide the email domain (via that PM) that you'd like me to check for any blacklisting on?

 

[NikosT_3CX]

@it-department@sogimsyndic I found an email which is similar with your forum user and i removed it form the bounce list. Only this though, not anything else.
Check it out and let us know if this works now.

 

[it-department@sogimsyndic]

Ok, now e-mail is working again. Thanks a lot for your help.

Btw, to avoid these problems - ignoring that your domain is blacklisted by 3CX - that it will be a must to have the possibility to set a backup e-mail address (on an other domain) to receive the most important warning messages.
In our case, the main problem was that we do not receive any voicemail messages anymore. Luckily, we have our backups and all messages could be restored.

Best regards

 

[VasilisV_3CX]

Glad to hear that your email functionality is restored @it-department@sogimsyndic. If you need anything else, feel free to open a new thread.