Delivery of e-mail depends on DNS, correct setup of the mail server etc. Where it has been working fine then stops abruptly without any changes on the ipcortex appliance it is worth checking for changes elsewhere in the network.
Things to check include:
- If an explicit mail forwarder is setup in the PBX global config
(Mail delivery SMTP server in the e-mail settings): check this is
still the correct hostname or IP address and hasn’t been moved.
- Where there isn’t an explicit Mail delivery SMTP server and you are
instead relying on DNS MX records: check the internal DNS servers
answer with useaable MX and A records for the normal mail servers.
- Check that there are no connectivity problems to the mailservers.
- If all the above check out and you think that the emails are reaching
the server but not users’ mailbox: check the mail server logs to
ensure that the voicemails are not being received but then
classified and spam.
Check the appliance mail logs (go to monitor, logs and then choose “Maillog mode”):
This will tell you what happened to individual e-mails. Leave a voicemail, and then inspect the log to get a trace of what happened to the e-mail transfer. This will generally tell you if delivery to the mailserver has taken place, but won’t tell you if/why the mailserver then dropped the e-mail because of e.g. a bad spam filtering rule.
Let us know if you need any more help having reviewed the above.