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SMTP Send Mail Error: 5.5.4 Invalid Address

Article ID: 401  |  Last updated: 26 Jun, 2017


The SMTP server returns the following error about email sent from Helix ALM products:

'The SMTP host’s reply to the MAIL command was 501, but it was expected to be 250. The reply text was “5.5.4 Invalid Address”.'


The email address may include Unicode characters. SMTP does not support non-ASCII characters in email usernames. For example, in, myname cannot include Unicode characters.


Remove the Unicode characters from the email username and resend the message.

Article ID: 401  |   Last updated: 26 Jun, 2017
SMTP 5.5.4 invalid address

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