asked on

501 Domain must resolve

Hi,

Have a problem with email, where if I do not route our exchange mail through our ISP's smart host then a certain domain wont allow our email (genzone.net).

I simply cannot route the mail through the smart host though, because we get loads of bouce backs again because its sees to much of our mail as spam due a CMAE Filter, BTW my ISP is DEMON, and this isn't happening to just me.

I cannot see my current mx record though.

Is the reason why my messages are being blocked by genzone.net because I haven't got an MX Record?

Thanks
Luke

florin_s

Hi,

Please see below link for detailed description: "Syntax error in parameters or arguments (e.g. invalid email address)"
http://www.answersthatwork.com/Download_Area/ATW_Library/Networking/Network__3-SMTP_Server_Status_Codes_and_SMTP_Error_Codes.pdf

xObIA

ASKER

Thanks, although surely if this was an incorrect address or "Syntax error in parameters or arguments (e.g. invalid email address)" then the mail wouldn't route in any situation?

florin_s

what dose an internet message header say, from one of these e-mails?

Mohammed Khawaja

Check www.mxtoolbox.com and post the results.

Naushad shaikh

You are getting email bounce from those recipient email domain which are configure for the revers lookup , these server are checking your PTR record no matter you send email with your smarthost or directly with your exchange server . you have to configure your PTR with you ISP end for your server ISP which you are using for public IP for your exchange server .till time reverse query will fail for your server (genzone.net). this issue will remain same.because your email header consist xyz@genzone.net what is public IP for this server and is name and IP matching

ASKER CERTIFIED SOLUTION

Simon Butler (Sembee)

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial