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locika

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Hy!

I'm using the latest available trial version of Kerio Mailserver. When i send an e-mail to a given e-mail address i get a returned e-mail: (mail.interneteuropa.hu: 550-Invalid HELO. You must be spam or a virus, or your system administrator is 550 an idiot.)

Am I really an idiot, or there is something else? Where can i set the "HELO" name of the mail server.

Thanxxx!
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Kerio_ktrumbull

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In the Admin Console, go to Configuration -> Domains. The Internet Hostname field at the top is how your MailServer greets itself to other mail servers (aka it is what is used in the helo/ehlo command). You can change the Internet Hostname to a FQDN.

Kevin Trumbull
Kerio Technical Support Team Leader
http://support.kerio.com
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Slaine

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As far as I know Kerio uses the Internet Hostname value under Domains as the Helo value.

I can see where this one is going though - RFC 2821. The most often incorrectly interpreted RFC. In very short; Your HELO name must match rDNS (PTR record) assigned to your public IP address for the SMTP service, and the PTR record must exist.

There's a whole lot of buts and ifs, but thats how far most people normally implement it, leaving the rest out and making it useless as a standard.

- Pierre Roux
http://www.ozone.co.za/ (My Job)
http://seven.dfx.co.za/ (My Hobby)
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freakinvibe

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If you are a rather small company, but you have your own mail server, you normally have no control over your public PTR records. So if you would like your mail server to be named

mail.mycompany.com

but your ISP assigned you the PTR

38-152-22-62.static.myisp.com

you have a problem. You could either ask your ISP to change it (for small customers they normally don't do that) or set your host name to 38-152-22-62.static.myisp.com in KMS.

Or you can violate the RFC, which was not a problem for me in most cases (not many mail servers really require the PTR to match the helo entry).

Regards, Pascal

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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Slaine

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...or just use your IP address as the HELO, as that won't violate the RFC.

- Pierre Roux
http://www.ozone.co.za/ (My Job)
http://seven.dfx.co.za/ (My Hobby)
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sedell

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It may not violate the RFC, but there are a fair amount of mailservers out there that require a FQDN before they'll accept mail.

Scott
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freakinvibe

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Yes, you should put the FQDN (even if different from the PTR).

Some mail servers freak out if they get something like

HELO novaliddomain

Regards, Pascal

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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