Mailing List Message #106156
From: Jeff Wark <>
Subject: SMTPUTF8 in MAIL FROM command
Date: Tue, 30 Aug 2016 12:34:21 -0400
To: CGate Mailing List <>
X-Mailer: CommuniGate Pro WebUser v6.0.11
I have one customer that is attempting to send email using Outlook 2016 (I think).  Their MAIL FROM command looks like this:

10:09:47.618 4 SMTPI-548278([]) cmd: MAIL FROM: <> SMTPUTF8
10:09:49.621 4 SMTPI-548278([]) rsp: 555 syntax error in MAIL FROM parameters
10:09:52.136 4 SMTPI-548278([]) cmd: QUIT

Is that some standard that we (CommuniGate server users) should be accepting at this point (the SMTPUTF8 string at the end of the command)?  I am using CommuniGate 6.0.11 right now, but I can see no mention of the string SMTPUTF8 in the history for versions 6.0 or 6.1.

According to, one feature of this extension is that email addresses containing non-ascii characters can be used.  However, not many mail servers seem to support it.

Again, looking in my logs, I can see only one customer attempting to use it at this point.

Anyone else have experience with this?


Jeff Wark
Tbaytel Internet
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