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7/28/15
Original Poster
Lucky Nkhwiza Gumboh

Gmail sending Error 500 Syntax error, command unrecognized

Anyone with a solution to this is issue. All emails from gmail and google hosted domains fail to delivery with the error:'The error that the other server returned was: 500 Syntax error, command unrecognized'.

Some forums suggest this is cause when SMTP inspection is enabled on ASA firewall. The recipient network does not have a ASA firewall installed but they do use on Cisco 800 series router as a gateway routing device
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7/28/15
Expert - Community Specialist
Monica J.
Hi Lucky Nkhwiza Gumboh,

Welcome to the Gmail forum!

Please take a look at this thread which helped a user solve the problem.

Let me know if this helps.  Thank you!

Best,
Monica
7/28/15
Original Poster
Lucky Nkhwiza Gumboh
Hi Monica,

Many thanks for getting back to me.
The network does not have an ASA firewall. There is a Cisco 800 series
deployed but it does not have any ip inspect of any protocol enabled.
 
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