Document information
| Document ID: | 4663 |
|---|---|
| Subject: | Resolved IP in HELO string does not match with Sender IP |
| Creation date: | 12/14/15 4:35 PM |
| Last modified on: | 8/13/18 10:52 AM |
Resolved IP in HELO string does not match with Sender IP
Problem
Some emails are being rejected for the following reason.
Resolved IP in HELO string does not match with Sender IP
Explanation
When a sender SMTP server connects to your email server, it sends a HELO string, which looks like:
EHLO mail.senderDomain.com
Among other email etiquettes, the domain name present in the HELO command should match with the sender's IP address. For example, if an email originates from 200.199.198.197 the host name mail.senderDomain.com should resolve to this IP. If it resolves to a different IP address, Xeams is going to assign a score to this message.
Most legitimate email servers will use a matching host name in the HELO command. If you see a good email getting this score, consider letting the sender know that their email server is not configured correctly.
User comments
Posted by dcol on 6/7/16 6:12 PM
I find this is a common occurrence with local email. To fix, just add the local LAN to the whitelist. ie 192.168.1.*
Add a comment to this document
Do you have a helpful tip related to this document that you'd like to share with other users?
Important: This area is reserved for useful tips. Therefore, do not post questions here. Instead, use our public forums to post questions.