|Subject:||Troubleshooting inbound email|
|Creation date:||12/14/15 4:35 PM|
|Last modified on:||5/18/22 9:39 AM|
|Hop# 1||John sends an email to Mary. John's SMTP server receives the messages.
John's SMTP server does an MX lookup to find the IP address of Mary's SMTP server. If John's SMTP server is unable to find an MX record, it will generate an NDR (non-delivery report) back to John notifying the server is not found.
Click here to see what could go wrong at this step.
|Hop# 2||The message comes across the Internet and hits your network firewall. There are two firewalls typically involved:
|Hop# 3||The message is sent from your firewall to Xeams. Once a message reaches this far, you should be able to see the communication in either
Xeams could reject incoming messages for multiple reasons, including an invalid recipient, invalid domain or the message size is too big. Regardless of the reason, you should see the exact cause in the log file. Click here for details.
|Hop# 4||Xeams sends the message to the downstream server. This server only exists when you use Xeams in either Hybrid or Firewall mode.
You can confirm this delivery by check one of the following:
|Hop# 5||The SMTP server downstream puts the message in user's INBOX. Every email server has the ability to block emails. If you see a message delivered all the way to Hop# 4 but user still does not see it in the inbox, check the server downstream to ensure filtering is disabled.|
Posted by Dennis on 6/12/14 9:35 AM
Posted by Tryphon on 6/12/14 7:57 AM
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