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Hi Guys, im having problem with my kerio mailserver, this is the first time i've encountered this error

5.1.0 - Unknown address error 554-'5.7.1 This message has been blocked because the HELO/EHLO domain is invalid.

Thanks in advance Razz

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Do you have a FQDN for the mailserver name? That could cause the error. At the very top of the Domains screen is the Internet Hostname setting. Check that. It should look something like


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The internet hostname must have a DNS A record visible in the internet. Some mail servers check this to avoid spam.

Example: You internet hostname entry in KMS should be and not just mymailserver.

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