LanMan6401
asked on
550 5.7.1 Helo command rejected: Host not found
A user was trying to email us, they received this error. This user has emailed in the past and has been able to email us after getting this error. It happened on two separate occasions about two days apart. I'm trying to determine what the error exactly is.
The receiving email server has a good DNS report, spf, reverse DNS, etc.
I see no log of either email in our spam software, the user had to send me this returned email error, it looks like we never received it to even reject it.
The receiving email server has a good DNS report, spf, reverse DNS, etc.
I see no log of either email in our spam software, the user had to send me this returned email error, it looks like we never received it to even reject it.
The message that you sent was undeliverable to the following:
user@domain.com (550 5.7.1 <domain.com>: Helo command rejected: Host not found)
Possibly truncated original message follows:
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ASKER
Thanks!
Sorry - incorrect info - missed part of their domain name when copying / pasting.
Their problems are:
MX records do not match Reverse DNS records
Mailserver Greeting domain names do not exist
Not essential, but no SPF record.
Their problems are:
MX records do not match Reverse DNS records
Mailserver Greeting domain names do not exist
Not essential, but no SPF record.
So it looks like your anti-spam software is checking their HELO name and finding it does not exist and rejecting them.
Have you upgraded / changed your anti-spam software lately?
Have you upgraded / changed your anti-spam software lately?
ASKER
Yes, but a user is white listed once we send out to them. The user account had sent email before and after the initial email blocks, with no log of being blocked in the spam software I use, Vamsoft's ORF.
I think I know what it is. Zoneedit is the DNS host I use for this domain. A few times this past year they have blocked email before we ever get it. I'm willing to bet they blocked it before we received it. I have no means of seeing a log from zoneedit, which is kinda frustrating. I've been moving my DNS hosting to nettica.com. They also block some email but provide a whitelist and log, just in case.
Thanks again for your help, Alan.
I think I know what it is. Zoneedit is the DNS host I use for this domain. A few times this past year they have blocked email before we ever get it. I'm willing to bet they blocked it before we received it. I have no means of seeing a log from zoneedit, which is kinda frustrating. I've been moving my DNS hosting to nettica.com. They also block some email but provide a whitelist and log, just in case.
Thanks again for your help, Alan.
No problems - sorry for the initial confusion over the domain.
I too use Vamsoft - great product isn't it?
I too use Vamsoft - great product isn't it?
ASKER
I absolutely love it and recommend it to everyone. Easy to use, inexpensive and works great! I've used it for the past six years (I think I've had it that long?) and they continue to add features. The honeypot was brilliant.
Alternatively, please see these previous EE questions:
http://www.experts-exchang
http://www.experts-exchang