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Some mail servers will only accept valid hostnames with the HELO command.<br />
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You should put the hostname of your mail server, and make sure there's a DNS record for it pointing to its public IP.
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Some mail servers will only accept valid hostnames with the HELO command.

You should put the hostname of your mail server, and make sure there's a DNS record for it pointing to its public IP.

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I've asked this before and thought I had resolved but the problem still occurs!<br />
<br />
A user is emailing a particular domain and getting the following error:<br />
<br />
riverexch.riverltd.co.uk #5.5.0 smtp;550 Sorry, your HELO/EHLO greeting must resolve (#5.7.1)<br />
<br />
Under SMTP VS Properties the FQDN is set to riverexch.riverltd.co.uk but the Masquerade domain field is blank...could I put something in here to resolve i.e our email domain which is therivergroup.co.uk??<br />
<br />
Confused!
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I've asked this before and thought I had resolved but the problem still occurs!

A user is emailing a particular domain and getting the following error:

riverexch.riverltd.co.uk #5.5.0 smtp;550 Sorry, your HELO/EHLO greeting must resolve (#5.7.1)

Under SMTP VS Properties the FQDN is set to riverexch.riverltd.co.uk but the Masquerade domain field is blank...could I put something in here to resolve i.e our email domain which is therivergroup.co.uk??

Confused!

HELO/EHLO Greeting

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.